399867730 has 16 divisors (see below), whose sum is σ = 757644480. Its totient is φ = 151528752.

The previous prime is 399867701. The next prime is 399867737. The reversal of 399867730 is 37768993.

399867730 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (399867737) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1052094 + ... + 1052473.

It is an arithmetic number, because the mean of its divisors is an integer number (47352780).

Almost surely, 2^399867730 is an apocalyptic number.

399867730 is a deficient number, since it is larger than the sum of its proper divisors (357776750).

399867730 is a wasteful number, since it uses less digits than its factorization.

399867730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2104593.

The product of its (nonzero) digits is 1714608, while the sum is 52.

The square root of 399867730 is about 19996.6929765899. The cubic root of 399867730 is about 736.7250763002.

The spelling of 399867730 in words is "three hundred ninety-nine million, eight hundred sixty-seven thousand, seven hundred thirty".