981406590 has 32 divisors (see below), whose sum is σ = 2395301760. Its totient is φ = 257272224.

The previous prime is 981406589. The next prime is 981406607. The reversal of 981406590 is 95604189.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 275464 + ... + 279003.

It is an arithmetic number, because the mean of its divisors is an integer number (74853180).

Almost surely, 2^981406590 is an apocalyptic number.

981406590 is an abundant number, since it is smaller than the sum of its proper divisors (1413895170).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

981406590 is a wasteful number, since it uses less digits than its factorization.

981406590 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 554536.

The product of its (nonzero) digits is 77760, while the sum is 42.

The square root of 981406590 is about 31327.4095641500. The cubic root of 981406590 is about 993.7633821227.

The spelling of 981406590 in words is "nine hundred eighty-one million, four hundred six thousand, five hundred ninety".