978740406 has 72 divisors (see below), whose sum is σ = 2471904864. Its totient is φ = 279064800.

The previous prime is 978740381. The next prime is 978740417. The reversal of 978740406 is 604047879.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 617491 + ... + 619073.

It is an arithmetic number, because the mean of its divisors is an integer number (34332012).

Almost surely, 2^978740406 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 978740406, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1235952432).

978740406 is an abundant number, since it is smaller than the sum of its proper divisors (1493164458).

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

978740406 is a wasteful number, since it uses less digits than its factorization.

978740406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2306 (or 2296 counting only the distinct ones).

The product of its (nonzero) digits is 338688, while the sum is 45.

The square root of 978740406 is about 31284.8270891817. The cubic root of 978740406 is about 992.8626480706.

The spelling of 978740406 in words is "nine hundred seventy-eight million, seven hundred forty thousand, four hundred six".