399919320 has 48 divisors (see below), whose sum is σ = 1299738960. Its totient is φ = 106645056.

The previous prime is 399919301. The next prime is 399919321. The reversal of 399919320 is 23919993.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399919321) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 555084 + ... + 555803.

It is an arithmetic number, because the mean of its divisors is an integer number (27077895).

Almost surely, 2^399919320 is an apocalyptic number.

399919320 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

399919320 is an abundant number, since it is smaller than the sum of its proper divisors (899819640).

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

399919320 is a wasteful number, since it uses less digits than its factorization.

399919320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1110904 (or 1110897 counting only the distinct ones).

The product of its (nonzero) digits is 118098, while the sum is 45.

The square root of 399919320 is about 19997.9828982825. The cubic root of 399919320 is about 736.7567584536.

The spelling of 399919320 in words is "three hundred ninety-nine million, nine hundred nineteen thousand, three hundred twenty".