399199659497 has 4 divisors (see below), whose sum is σ = 399220778880. Its totient is φ = 399178540116.

The previous prime is 399199659461. The next prime is 399199659511. The reversal of 399199659497 is 794956991993.

It is a happy number.

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 399199659497 - 2¹⁴ = 399199643113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (399199650497) 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, 10531313 + ... + 10569150.

It is an arithmetic number, because the mean of its divisors is an integer number (99805194720).

Almost surely, 2^399199659497 is an apocalyptic number.

It is an amenable number.

399199659497 is a deficient number, since it is larger than the sum of its proper divisors (21119383).

399199659497 is a wasteful number, since it uses less digits than its factorization.

399199659497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21119382.

The product of its digits is 1339231320, while the sum is 80.

The spelling of 399199659497 in words is "three hundred ninety-nine billion, one hundred ninety-nine million, six hundred fifty-nine thousand, four hundred ninety-seven".