399854040 has 64 divisors (see below), whose sum is σ = 1207560960. Its totient is φ = 105916800.

The previous prime is 399854029. The next prime is 399854053. The reversal of 399854040 is 40458993.

It is a junction number, because it is equal to n+sod(n) for n = 399853983 and 399854001.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7087 + ... + 29153.

It is an arithmetic number, because the mean of its divisors is an integer number (18868140).

Almost surely, 2^399854040 is an apocalyptic number.

399854040 is a gapful number since it is divisible by the number (30) 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 399854040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (603780480).

399854040 is an abundant number, since it is smaller than the sum of its proper divisors (807706920).

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

399854040 is a wasteful number, since it uses less digits than its factorization.

399854040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22232 (or 22228 counting only the distinct ones).

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

The square root of 399854040 is about 19996.3506670592. The cubic root of 399854040 is about 736.7166686188.

The spelling of 399854040 in words is "three hundred ninety-nine million, eight hundred fifty-four thousand, forty".