399671954 has 24 divisors (see below), whose sum is σ = 693653520. Its totient is φ = 172105560.

The previous prime is 399671953. The next prime is 399671983. The reversal of 399671954 is 459176993.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 399671896 and 399671905.

It is not an unprimeable number, because it can be changed into a prime (399671953) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 38864 + ... + 48059.

It is an arithmetic number, because the mean of its divisors is an integer number (28902230).

Almost surely, 2^399671954 is an apocalyptic number.

399671954 is a deficient number, since it is larger than the sum of its proper divisors (293981566).

399671954 is a wasteful number, since it uses less digits than its factorization.

399671954 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86966 (or 86955 counting only the distinct ones).

The product of its digits is 1837080, while the sum is 53.

The square root of 399671954 is about 19991.7971678386. The cubic root of 399671954 is about 736.6048226738.

The spelling of 399671954 in words is "three hundred ninety-nine million, six hundred seventy-one thousand, nine hundred fifty-four".