399618401 has 8 divisors (see below), whose sum is σ = 491838144. Its totient is φ = 316181520.

The previous prime is 399618397. The next prime is 399618407. The reversal of 399618401 is 104816993.

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 399618401 - 2² = 399618397 is a prime.

It is not an unprimeable number, because it can be changed into a prime (399618407) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2195615 + ... + 2195796.

It is an arithmetic number, because the mean of its divisors is an integer number (61479768).

Almost surely, 2^399618401 is an apocalyptic number.

It is an amenable number.

399618401 is a deficient number, since it is larger than the sum of its proper divisors (92219743).

399618401 is a wasteful number, since it uses less digits than its factorization.

399618401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4391431.

The product of its (nonzero) digits is 46656, while the sum is 41.

The square root of 399618401 is about 19990.4577486360. The cubic root of 399618401 is about 736.5719213908.

The spelling of 399618401 in words is "three hundred ninety-nine million, six hundred eighteen thousand, four hundred one".