399551026 has 8 divisors (see below), whose sum is σ = 684944640. Its totient is φ = 171236148.

The previous prime is 399551023. The next prime is 399551063. The reversal of 399551026 is 620155993.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 399551026.

It is not an unprimeable number, because it can be changed into a prime (399551023) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14269666 + ... + 14269693.

It is an arithmetic number, because the mean of its divisors is an integer number (85618080).

Almost surely, 2^399551026 is an apocalyptic number.

399551026 is a deficient number, since it is larger than the sum of its proper divisors (285393614).

399551026 is a wasteful number, since it uses less digits than its factorization.

399551026 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28539368.

The product of its (nonzero) digits is 72900, while the sum is 40.

The square root of 399551026 is about 19988.7724985803. The cubic root of 399551026 is about 736.5305241293.

The spelling of 399551026 in words is "three hundred ninety-nine million, five hundred fifty-one thousand, twenty-six".