399019265849 has 4 divisors (see below), whose sum is σ = 399034538640. Its totient is φ = 399003993060.

The previous prime is 399019265837. The next prime is 399019265923. The reversal of 399019265849 is 948562910993.

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 a de Polignac number, because none of the positive numbers 2^k-399019265849 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (399019465849) 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, 7597139 + ... + 7649480.

It is an arithmetic number, because the mean of its divisors is an integer number (99758634660).

Almost surely, 2^399019265849 is an apocalyptic number.

It is an amenable number.

399019265849 is a deficient number, since it is larger than the sum of its proper divisors (15272791).

399019265849 is a wasteful number, since it uses less digits than its factorization.

399019265849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15272790.

The product of its (nonzero) digits is 37791360, while the sum is 65.

The spelling of 399019265849 in words is "three hundred ninety-nine billion, nineteen million, two hundred sixty-five thousand, eight hundred forty-nine".