399378876 has 48 divisors (see below), whose sum is σ = 1013951904. Its totient is φ = 121614336.

The previous prime is 399378821. The next prime is 399378911. The reversal of 399378876 is 678873993.

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, 1936 + ... + 28328.

It is an arithmetic number, because the mean of its divisors is an integer number (21123998).

Almost surely, 2^399378876 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 399378876, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (506975952).

399378876 is an abundant number, since it is smaller than the sum of its proper divisors (614573028).

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

399378876 is a wasteful number, since it uses less digits than its factorization.

399378876 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26510 (or 26508 counting only the distinct ones).

The product of its digits is 13716864, while the sum is 60.

The square root of 399378876 is about 19984.4658672680. The cubic root of 399378876 is about 736.4247287607.

The spelling of 399378876 in words is "three hundred ninety-nine million, three hundred seventy-eight thousand, eight hundred seventy-six".