236138640 has 40 divisors (see below), whose sum is σ = 732030528. Its totient is φ = 62970240.

The previous prime is 236138633. The next prime is 236138641. The reversal of 236138640 is 46831632.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×236138640² = 111522914602099200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (236138641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 491716 + ... + 492195.

Almost surely, 2^236138640 is an apocalyptic number.

236138640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

236138640 is an abundant number, since it is smaller than the sum of its proper divisors (495891888).

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

236138640 is a wasteful number, since it uses less digits than its factorization.

236138640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 983927 (or 983921 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 33.

The square root of 236138640 is about 15366.8031808831. The cubic root of 236138640 is about 618.0956482072.

The spelling of 236138640 in words is "two hundred thirty-six million, one hundred thirty-eight thousand, six hundred forty".