981394779 has 16 divisors (see below), whose sum is σ = 1332977184. Its totient is φ = 642086400.

The previous prime is 981394763. The next prime is 981394781. The reversal of 981394779 is 977493189.

It is not a de Polignac number, because 981394779 - 2⁴ = 981394763 is a prime.

It is not an unprimeable number, because it can be changed into a prime (981394759) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 78547 + ... + 90179.

It is an arithmetic number, because the mean of its divisors is an integer number (83311074).

Almost surely, 2^981394779 is an apocalyptic number.

981394779 is a deficient number, since it is larger than the sum of its proper divisors (351582405).

981394779 is a wasteful number, since it uses less digits than its factorization.

981394779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12158.

The product of its digits is 3429216, while the sum is 57.

The square root of 981394779 is about 31327.2210545398. The cubic root of 981394779 is about 993.7593955363.

The spelling of 981394779 in words is "nine hundred eighty-one million, three hundred ninety-four thousand, seven hundred seventy-nine".