399285240 has 32 divisors (see below), whose sum is σ = 1197856080. Its totient is φ = 106476032.

The previous prime is 399285233. The next prime is 399285259. The reversal of 399285240 is 42582993.

It is a hoax number, since the sum of its digits (42) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 399285192 and 399285201.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1663569 + ... + 1663808.

Almost surely, 2^399285240 is an apocalyptic number.

399285240 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

399285240 is an abundant number, since it is smaller than the sum of its proper divisors (798570840).

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

399285240 is a wasteful number, since it uses less digits than its factorization.

399285240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3327391 (or 3327387 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 42.

The square root of 399285240 is about 19982.1230103310. The cubic root of 399285240 is about 736.3671716725.

The spelling of 399285240 in words is "three hundred ninety-nine million, two hundred eighty-five thousand, two hundred forty".