158621940 has 36 divisors (see below), whose sum is σ = 481153764. Its totient is φ = 42299136.

The previous prime is 158621927. The next prime is 158621977. The reversal of 158621940 is 49126851.

It can be written as a sum of positive squares in 2 ways, for example, as 104775696 + 53846244 = 10236^2 + 7338^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 158621895 and 158621904.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 440437 + ... + 440796.

Almost surely, 2^158621940 is an apocalyptic number.

158621940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

158621940 is an abundant number, since it is smaller than the sum of its proper divisors (322531824).

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

158621940 is a wasteful number, since it uses less digits than its factorization.

158621940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 881248 (or 881243 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The square root of 158621940 is about 12594.5202369920. The cubic root of 158621940 is about 541.3204311449.

The spelling of 158621940 in words is "one hundred fifty-eight million, six hundred twenty-one thousand, nine hundred forty".