399397726 has 48 divisors (see below), whose sum is σ = 754110000. Its totient is φ = 157248000.

The previous prime is 399397697. The next prime is 399397729. The reversal of 399397726 is 627793993.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399397729) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 319150 + ... + 320398.

It is an arithmetic number, because the mean of its divisors is an integer number (15710625).

Almost surely, 2^399397726 is an apocalyptic number.

399397726 is a deficient number, since it is larger than the sum of its proper divisors (354712274).

399397726 is a wasteful number, since it uses less digits than its factorization.

399397726 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1529 (or 1522 counting only the distinct ones).

The product of its digits is 3857868, while the sum is 55.

The square root of 399397726 is about 19984.9374780108. The cubic root of 399397726 is about 736.4363145744.

The spelling of 399397726 in words is "three hundred ninety-nine million, three hundred ninety-seven thousand, seven hundred twenty-six".