399542328 has 32 divisors (see below), whose sum is σ = 1109840400. Its totient is φ = 133180704.

The previous prime is 399542327. The next prime is 399542357. The reversal of 399542328 is 823245993.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399542327) 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, 924651 + ... + 925082.

Almost surely, 2^399542328 is an apocalyptic number.

It is an amenable number.

399542328 is an abundant number, since it is smaller than the sum of its proper divisors (710298072).

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

399542328 is a wasteful number, since it uses less digits than its factorization.

399542328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1849748 (or 1849738 counting only the distinct ones).

The product of its digits is 466560, while the sum is 45.

The square root of 399542328 is about 19988.5549252566. The cubic root of 399542328 is about 736.5251794727.

The spelling of 399542328 in words is "three hundred ninety-nine million, five hundred forty-two thousand, three hundred twenty-eight".