238403638 has 24 divisors (see below), whose sum is σ = 396216576. Its totient is φ = 107498160.

The previous prime is 238403623. The next prime is 238403657. The reversal of 238403638 is 836304832.

It is a super-2 number, since 2×238403638² = 113672589223270088, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 238403597 and 238403606.

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, 26856 + ... + 34612.

It is an arithmetic number, because the mean of its divisors is an integer number (16509024).

Almost surely, 2^238403638 is an apocalyptic number.

238403638 is a deficient number, since it is larger than the sum of its proper divisors (157812938).

238403638 is a wasteful number, since it uses less digits than its factorization.

238403638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7908 (or 7897 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 37.

The square root of 238403638 is about 15440.3250613450. The cubic root of 238403638 is about 620.0655827261.

The spelling of 238403638 in words is "two hundred thirty-eight million, four hundred three thousand, six hundred thirty-eight".