399321101 has 4 divisors (see below), whose sum is σ = 416682912. Its totient is φ = 381959292.

The previous prime is 399321089. The next prime is 399321107. The reversal of 399321101 is 101123993.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 399321101 - 2⁶ = 399321037 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399321107) 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, 8680871 + ... + 8680916.

It is an arithmetic number, because the mean of its divisors is an integer number (104170728).

Almost surely, 2^399321101 is an apocalyptic number.

It is an amenable number.

399321101 is a deficient number, since it is larger than the sum of its proper divisors (17361811).

399321101 is a wasteful number, since it uses less digits than its factorization.

399321101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17361810.

The product of its (nonzero) digits is 1458, while the sum is 29.

The square root of 399321101 is about 19983.0203172594. The cubic root of 399321101 is about 736.3892161242.

The spelling of 399321101 in words is "three hundred ninety-nine million, three hundred twenty-one thousand, one hundred one".