2539622399 has 4 divisors (see below), whose sum is σ = 2542600536. Its totient is φ = 2536644264.

The previous prime is 2539622389. The next prime is 2539622413. The reversal of 2539622399 is 9932269352.

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 2539622399 - 2⁴ = 2539622383 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 (2539622339) 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, 1487789 + ... + 1489494.

It is an arithmetic number, because the mean of its divisors is an integer number (635650134).

Almost surely, 2^2539622399 is an apocalyptic number.

2539622399 is a deficient number, since it is larger than the sum of its proper divisors (2978137).

2539622399 is an equidigital number, since it uses as much as digits as its factorization.

2539622399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2978136.

The product of its digits is 1574640, while the sum is 50.

The square root of 2539622399 is about 50394.6663745282. Note that the first 3 decimals coincide. The cubic root of 2539622399 is about 1364.3413745747.

The spelling of 2539622399 in words is "two billion, five hundred thirty-nine million, six hundred twenty-two thousand, three hundred ninety-nine".