394631572 has 6 divisors (see below), whose sum is σ = 690605258. Its totient is φ = 197315784.

The previous prime is 394631569. The next prime is 394631579. The reversal of 394631572 is 275136493.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 339812356 + 54819216 = 18434^2 + 7404^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (394631579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49328943 + ... + 49328950.

Almost surely, 2^394631572 is an apocalyptic number.

It is an amenable number.

394631572 is a deficient number, since it is larger than the sum of its proper divisors (295973686).

394631572 is a wasteful number, since it uses less digits than its factorization.

394631572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98657897 (or 98657895 counting only the distinct ones).

The product of its digits is 136080, while the sum is 40.

The square root of 394631572 is about 19865.3359397721. The cubic root of 394631572 is about 733.4951994391.

The spelling of 394631572 in words is "three hundred ninety-four million, six hundred thirty-one thousand, five hundred seventy-two".