399406901 has 8 divisors (see below), whose sum is σ = 402738840. Its totient is φ = 396085248.

The previous prime is 399406877. The next prime is 399406921. The reversal of 399406901 is 109604993.

It can be written as a sum of positive squares in 4 ways, for example, as 55860676 + 343546225 = 7474^2 + 18535^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 399406901 - 2¹⁴ = 399390517 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399406921) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 88385 + ... + 92793.

It is an arithmetic number, because the mean of its divisors is an integer number (50342355).

Almost surely, 2^399406901 is an apocalyptic number.

It is an amenable number.

399406901 is a deficient number, since it is larger than the sum of its proper divisors (3331939).

399406901 is a wasteful number, since it uses less digits than its factorization.

399406901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5143.

The product of its (nonzero) digits is 52488, while the sum is 41.

The square root of 399406901 is about 19985.1670245710. The cubic root of 399406901 is about 736.4419536913.

The spelling of 399406901 in words is "three hundred ninety-nine million, four hundred six thousand, nine hundred one".