399982499 has 4 divisors (see below), whose sum is σ = 457122864. Its totient is φ = 342842136.

The previous prime is 399982493. The next prime is 399982559. The reversal of 399982499 is 994289993.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 994289993 = 173 ⋅5747341.

It is a de Polignac number, because none of the positive numbers 2^k-399982499 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (399982493) 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, 28570172 + ... + 28570185.

It is an arithmetic number, because the mean of its divisors is an integer number (114280716).

Almost surely, 2^399982499 is an apocalyptic number.

399982499 is a deficient number, since it is larger than the sum of its proper divisors (57140365).

399982499 is an equidigital number, since it uses as much as digits as its factorization.

399982499 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57140364.

The product of its digits is 11337408, while the sum is 62.

The square root of 399982499 is about 19999.5624702142. The cubic root of 399982499 is about 736.7955538655.

The spelling of 399982499 in words is "three hundred ninety-nine million, nine hundred eighty-two thousand, four hundred ninety-nine".