408774640 has 20 divisors (see below), whose sum is σ = 950401224. Its totient is φ = 163509824.

The previous prime is 408774629. The next prime is 408774647. The reversal of 408774640 is 46477804.

It is a tau number, because it is divible by the number of its divisors (20).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 408774593 and 408774602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (408774647) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2554762 + ... + 2554921.

Almost surely, 2^408774640 is an apocalyptic number.

408774640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

408774640 is an abundant number, since it is smaller than the sum of its proper divisors (541626584).

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

408774640 is a wasteful number, since it uses less digits than its factorization.

408774640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5109696 (or 5109690 counting only the distinct ones).

The product of its (nonzero) digits is 150528, while the sum is 40.

The square root of 408774640 is about 20218.1759810325. The cubic root of 408774640 is about 742.1550522014.

The spelling of 408774640 in words is "four hundred eight million, seven hundred seventy-four thousand, six hundred forty".