399869379 has 96 divisors (see below), whose sum is σ = 748500480. Its totient is φ = 208948896.

The previous prime is 399869377. The next prime is 399869389. The reversal of 399869379 is 973968993.

It is not a de Polignac number, because 399869379 - 2¹ = 399869377 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

Its product of digits (19840464) is a multiple of the sum of its prime factors (168).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399869377) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 3737044 + ... + 3737150.

It is an arithmetic number, because the mean of its divisors is an integer number (7796880).

Almost surely, 2^399869379 is an apocalyptic number.

399869379 is a gapful number since it is divisible by the number (39) formed by its first and last digit.

399869379 is a deficient number, since it is larger than the sum of its proper divisors (348631101).

399869379 is an equidigital number, since it uses as much as digits as its factorization.

399869379 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168 (or 130 counting only the distinct ones).

The product of its digits is 19840464, while the sum is 63.

The square root of 399869379 is about 19996.7342083651. The cubic root of 399869379 is about 736.7260890167.

The spelling of 399869379 in words is "three hundred ninety-nine million, eight hundred sixty-nine thousand, three hundred seventy-nine".