158021440 has 28 divisors (see below), whose sum is σ = 376289316. Its totient is φ = 63208448.

The previous prime is 158021419. The next prime is 158021449. The reversal of 158021440 is 44120851.

158021440 = T₃₅₈ + T₃₅₉ + ... + T₉₉₇.

It can be written as a sum of positive squares in 2 ways, for example, as 73822464 + 84198976 = 8592^2 + 9176^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (158021449) 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 3 ways as a sum of consecutive naturals, for example, 246589 + ... + 247228.

Almost surely, 2^158021440 is an apocalyptic number.

158021440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

158021440 is an abundant number, since it is smaller than the sum of its proper divisors (218267876).

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

158021440 is an equidigital number, since it uses as much as digits as its factorization.

158021440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 493834 (or 493824 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 25.

The square root of 158021440 is about 12570.6578984554. The cubic root of 158021440 is about 540.6364694683.

The spelling of 158021440 in words is "one hundred fifty-eight million, twenty-one thousand, four hundred forty".