239130640 has 80 divisors (see below), whose sum is σ = 639459072. Its totient is φ = 81464832.

The previous prime is 239130601. The next prime is 239130641. The reversal of 239130640 is 46031932.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a junction number, because it is equal to n+sod(n) for n = 239130599 and 239130608.

It is not an unprimeable number, because it can be changed into a prime (239130641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 92242 + ... + 94798.

Almost surely, 2^239130640 is an apocalyptic number.

239130640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 239130640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (319729536).

239130640 is an abundant number, since it is smaller than the sum of its proper divisors (400328432).

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

239130640 is a wasteful number, since it uses less digits than its factorization.

239130640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2744 (or 2738 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 28.

The square root of 239130640 is about 15463.8494560701. The cubic root of 239130640 is about 620.6952312171.

The spelling of 239130640 in words is "two hundred thirty-nine million, one hundred thirty thousand, six hundred forty".