399684532 has 24 divisors (see below), whose sum is σ = 792898400. Its totient is φ = 174760416.

The previous prime is 399684511. The next prime is 399684533. The reversal of 399684532 is 235486993.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399684533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 201282 + ... + 203257.

Almost surely, 2^399684532 is an apocalyptic number.

It is an amenable number.

399684532 is a deficient number, since it is larger than the sum of its proper divisors (393213868).

399684532 is a wasteful number, since it uses less digits than its factorization.

399684532 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 404575 (or 404573 counting only the distinct ones).

The product of its digits is 1399680, while the sum is 49.

The square root of 399684532 is about 19992.1117443856. Note that the first 3 decimals coincide. The cubic root of 399684532 is about 736.6125497761.

The spelling of 399684532 in words is "three hundred ninety-nine million, six hundred eighty-four thousand, five hundred thirty-two".