978740405 has 18 divisors (see below), whose sum is σ = 1249157826. Its totient is φ = 736038528.

The previous prime is 978740381. The next prime is 978740417. The reversal of 978740405 is 504047879.

It can be written as a sum of positive squares in 3 ways, for example, as 327827236 + 650913169 = 18106^2 + 25513^2 .

It is not a de Polignac number, because 978740405 - 2⁸ = 978740149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1188824 + ... + 1189646.

It is an arithmetic number, because the mean of its divisors is an integer number (69397657).

Almost surely, 2^978740405 is an apocalyptic number.

It is an amenable number.

978740405 is a deficient number, since it is larger than the sum of its proper divisors (270417421).

978740405 is an frugal number, since it uses more digits than its factorization.

978740405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1685 (or 845 counting only the distinct ones).

The product of its (nonzero) digits is 282240, while the sum is 44.

The square root of 978740405 is about 31284.8270731996. The cubic root of 978740405 is about 992.8626477325.

The spelling of 978740405 in words is "nine hundred seventy-eight million, seven hundred forty thousand, four hundred five".