158121040 has 240 divisors, whose sum is σ = 493629120. Its totient is φ = 46448640.

The previous prime is 158121037. The next prime is 158121043. The reversal of 158121040 is 40121851.

It is an interprime number because it is at equal distance from previous prime (158121037) and next prime (158121043).

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (158121043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 819184 + ... + 819376.

It is an arithmetic number, because the mean of its divisors is an integer number (2056788).

Almost surely, 2^158121040 is an apocalyptic number.

158121040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 158121040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (246814560).

158121040 is an abundant number, since it is smaller than the sum of its proper divisors (335508080).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

158121040 is a wasteful number, since it uses less digits than its factorization.

158121040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 250 (or 237 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 22.

The square root of 158121040 is about 12574.6188809045. The cubic root of 158121040 is about 540.7500322926.

Adding to 158121040 its reverse (40121851), we get a palindrome (198242891).

The spelling of 158121040 in words is "one hundred fifty-eight million, one hundred twenty-one thousand, forty".