158194638 has 72 divisors (see below), whose sum is σ = 404817192. Its totient is φ = 44507232.

The previous prime is 158194633. The next prime is 158194657. The reversal of 158194638 is 836491851.

158194638 is a `hidden beast` number, since 1 + 5 + 8 + 1 + 9 + 4 + 638 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 158194593 and 158194602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (158194633) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 57756 + ... + 60432.

It is an arithmetic number, because the mean of its divisors is an integer number (5622461).

Almost surely, 2^158194638 is an apocalyptic number.

158194638 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 158194638, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (202408596).

158194638 is an abundant number, since it is smaller than the sum of its proper divisors (246622554).

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

158194638 is a wasteful number, since it uses less digits than its factorization.

158194638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2766 (or 2756 counting only the distinct ones).

The product of its digits is 207360, while the sum is 45.

The square root of 158194638 is about 12577.5449909750. The cubic root of 158194638 is about 540.8339172872.

The spelling of 158194638 in words is "one hundred fifty-eight million, one hundred ninety-four thousand, six hundred thirty-eight".