408369978 has 16 divisors (see below), whose sum is σ = 907488960. Its totient is φ = 136123308.

The previous prime is 408369959. The next prime is 408369989. The reversal of 408369978 is 879963804.

It is a Harshad number since it is a multiple of its sum of digits (54), and also a Moran number because the ratio is a prime number: 7562407 = 408369978 / (4 + 0 + 8 + 3 + 6 + 9 + 9 + 7 + 8).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3781150 + ... + 3781257.

It is an arithmetic number, because the mean of its divisors is an integer number (56718060).

Almost surely, 2^408369978 is an apocalyptic number.

408369978 is an abundant number, since it is smaller than the sum of its proper divisors (499118982).

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

408369978 is a wasteful number, since it uses less digits than its factorization.

408369978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7562418 (or 7562412 counting only the distinct ones).

The product of its (nonzero) digits is 2612736, while the sum is 54.

The square root of 408369978 is about 20208.1661216450. The cubic root of 408369978 is about 741.9100752442.

The spelling of 408369978 in words is "four hundred eight million, three hundred sixty-nine thousand, nine hundred seventy-eight".