158646438 has 56 divisors (see below), whose sum is σ = 359089848. Its totient is φ = 52542432.

The previous prime is 158646407. The next prime is 158646451. The reversal of 158646438 is 834646851.

158646438 is a `hidden beast` number, since 1 + 586 + 4 + 64 + 3 + 8 = 666.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

Its product of digits (552960) is a multiple of the sum of its prime factors (720).

It is a nialpdrome in base 15.

It is a junction number, because it is equal to n+sod(n) for n = 158646393 and 158646402.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 339481 + ... + 339947.

Almost surely, 2^158646438 is an apocalyptic number.

158646438 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 158646438, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (179544924).

158646438 is an abundant number, since it is smaller than the sum of its proper divisors (200443410).

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

158646438 is an equidigital number, since it uses as much as digits as its factorization.

158646438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 720 (or 705 counting only the distinct ones).

The product of its digits is 552960, while the sum is 45.

The square root of 158646438 is about 12595.4927652712. The cubic root of 158646438 is about 541.3482973726.

The spelling of 158646438 in words is "one hundred fifty-eight million, six hundred forty-six thousand, four hundred thirty-eight".