158639040 has 448 divisors, whose sum is σ = 665195520. Its totient is φ = 34836480.

The previous prime is 158639021. The next prime is 158639057. The reversal of 158639040 is 40936851.

158639040 is a `hidden beast` number, since 1 + 586 + 39 + 0 + 40 = 666.

It is a tau number, because it is divible by the number of its divisors (448).

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 = 158638986 and 158639004.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2600610 + ... + 2600670.

Almost surely, 2^158639040 is an apocalyptic number.

158639040 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 158639040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (332597760).

158639040 is an abundant number, since it is smaller than the sum of its proper divisors (506556480).

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

158639040 is a wasteful number, since it uses less digits than its factorization.

158639040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137 (or 121 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The square root of 158639040 is about 12595.1990853658. The cubic root of 158639040 is about 541.3398825246.

The spelling of 158639040 in words is "one hundred fifty-eight million, six hundred thirty-nine thousand, forty".