238721646 has 64 divisors (see below), whose sum is σ = 513589248. Its totient is φ = 73801728.

The previous prime is 238721641. The next prime is 238721671. The reversal of 238721646 is 646127832.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (238721641) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 928750 + ... + 929006.

It is an arithmetic number, because the mean of its divisors is an integer number (8024832).

Almost surely, 2^238721646 is an apocalyptic number.

238721646 is an abundant number, since it is smaller than the sum of its proper divisors (274867602).

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

238721646 is a wasteful number, since it uses less digits than its factorization.

238721646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 465.

The product of its digits is 96768, while the sum is 39.

The square root of 238721646 is about 15450.6195992264. The cubic root of 238721646 is about 620.3411632592.

The spelling of 238721646 in words is "two hundred thirty-eight million, seven hundred twenty-one thousand, six hundred forty-six".