399145392911 has 4 divisors (see below), whose sum is σ = 399185602800. Its totient is φ = 399105183024.

The previous prime is 399145392901. The next prime is 399145392953. The reversal of 399145392911 is 119293541993.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 399145392911 - 2⁶ = 399145392847 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 (399145392901) 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, 20090051 + ... + 20109908.

It is an arithmetic number, because the mean of its divisors is an integer number (99796400700).

Almost surely, 2^399145392911 is an apocalyptic number.

399145392911 is a deficient number, since it is larger than the sum of its proper divisors (40209889).

399145392911 is an equidigital number, since it uses as much as digits as its factorization.

399145392911 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40209888.

The product of its digits is 2361960, while the sum is 56.

The spelling of 399145392911 in words is "three hundred ninety-nine billion, one hundred forty-five million, three hundred ninety-two thousand, nine hundred eleven".