238978490 has 16 divisors (see below), whose sum is σ = 431965440. Its totient is φ = 95190480.

The previous prime is 238978457. The next prime is 238978513. The reversal of 238978490 is 94879832.

It is a happy number.

It is a super-2 number, since 2×238978490² = 114221437365360200, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47606 + ... + 52385.

It is an arithmetic number, because the mean of its divisors is an integer number (26997840).

Almost surely, 2^238978490 is an apocalyptic number.

238978490 is a deficient number, since it is larger than the sum of its proper divisors (192986950).

238978490 is a wasteful number, since it uses less digits than its factorization.

238978490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100237.

The product of its (nonzero) digits is 870912, while the sum is 50.

The square root of 238978490 is about 15458.9291349692. The cubic root of 238978490 is about 620.5635614656.

The spelling of 238978490 in words is "two hundred thirty-eight million, nine hundred seventy-eight thousand, four hundred ninety".