245987979 has 4 divisors (see below), whose sum is σ = 327983976. Its totient is φ = 163991984.

The previous prime is 245987941. The next prime is 245987981. The reversal of 245987979 is 979789542.

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 245987979 - 2²⁰ = 244939403 is a prime.

It is not an unprimeable number, because it can be changed into a prime (245987939) 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, 40997994 + ... + 40997999.

It is an arithmetic number, because the mean of its divisors is an integer number (81995994).

Almost surely, 2^245987979 is an apocalyptic number.

245987979 is a deficient number, since it is larger than the sum of its proper divisors (81995997).

245987979 is an equidigital number, since it uses as much as digits as its factorization.

245987979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81995996.

The product of its digits is 11430720, while the sum is 60.

The square root of 245987979 is about 15684.0039211931. The cubic root of 245987979 is about 626.5724492741.

The spelling of 245987979 in words is "two hundred forty-five million, nine hundred eighty-seven thousand, nine hundred seventy-nine".