2399390761 has 4 divisors (see below), whose sum is σ = 2540531412. Its totient is φ = 2258250112.

The previous prime is 2399390713. The next prime is 2399390767. The reversal of 2399390761 is 1670939932.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2213232025 + 186158736 = 47045^2 + 13644^2 .

It is a cyclic number.

It is not a de Polignac number, because 2399390761 - 2¹³ = 2399382569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2399390767) 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, 70570300 + ... + 70570333.

It is an arithmetic number, because the mean of its divisors is an integer number (635132853).

Almost surely, 2^2399390761 is an apocalyptic number.

It is an amenable number.

2399390761 is a deficient number, since it is larger than the sum of its proper divisors (141140651).

2399390761 is a wasteful number, since it uses less digits than its factorization.

2399390761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141140650.

The product of its (nonzero) digits is 551124, while the sum is 49.

The square root of 2399390761 is about 48983.5764414972. The cubic root of 2399390761 is about 1338.7526003931.

The spelling of 2399390761 in words is "two billion, three hundred ninety-nine million, three hundred ninety thousand, seven hundred sixty-one".