399189971554 has 32 divisors (see below), whose sum is σ = 659436137280. Its totient is φ = 181224720160.

The previous prime is 399189971549. The next prime is 399189971603. The reversal of 399189971554 is 455179981993.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 2060877 + ... + 2246239.

It is an arithmetic number, because the mean of its divisors is an integer number (20607379290).

Almost surely, 2^399189971554 is an apocalyptic number.

399189971554 is a deficient number, since it is larger than the sum of its proper divisors (260246165726).

399189971554 is a wasteful number, since it uses less digits than its factorization.

399189971554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 186207 (or 186185 counting only the distinct ones).

The product of its digits is 110224800, while the sum is 70.

The spelling of 399189971554 in words is "three hundred ninety-nine billion, one hundred eighty-nine million, nine hundred seventy-one thousand, five hundred fifty-four".