399999954 has 32 divisors (see below), whose sum is σ = 806682240. Its totient is φ = 132225152.

The previous prime is 399999949. The next prime is 399999959. The reversal of 399999954 is 459999993.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (399999949) and next prime (399999959).

It is not an unprimeable number, because it can be changed into a prime (399999959) 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 15 ways as a sum of consecutive naturals, for example, 501484 + ... + 502280.

It is an arithmetic number, because the mean of its divisors is an integer number (25208820).

Almost surely, 2^399999954 is an apocalyptic number.

399999954 is an abundant number, since it is smaller than the sum of its proper divisors (406682286).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

399999954 is a wasteful number, since it uses less digits than its factorization.

399999954 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1394.

The product of its digits is 31886460, while the sum is 66.

The square root of 399999954 is about 19999.9988500000. The cubic root of 399999954 is about 736.8062714838.

The spelling of 399999954 in words is "three hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred fifty-four".