399908458497 has 4 divisors (see below), whose sum is σ = 533211278000. Its totient is φ = 266605638996.

The previous prime is 399908458471. The next prime is 399908458501. The reversal of 399908458497 is 794854809993.

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, and also an emirpimes, since its reverse is a distinct semiprime: 794854809993 = 3 ⋅264951603331.

It is not a de Polignac number, because 399908458497 - 2²⁰ = 399907409921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (399908458097) 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, 66651409747 + ... + 66651409752.

It is an arithmetic number, because the mean of its divisors is an integer number (133302819500).

Almost surely, 2^399908458497 is an apocalyptic number.

It is an amenable number.

399908458497 is a deficient number, since it is larger than the sum of its proper divisors (133302819503).

399908458497 is a wasteful number, since it uses less digits than its factorization.

399908458497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133302819502.

The product of its (nonzero) digits is 705438720, while the sum is 75.

The spelling of 399908458497 in words is "three hundred ninety-nine billion, nine hundred eight million, four hundred fifty-eight thousand, four hundred ninety-seven".