405880868 has 12 divisors (see below), whose sum is σ = 734784540. Its totient is φ = 195942432.

The previous prime is 405880859. The next prime is 405880927. The reversal of 405880868 is 868088504.

It can be written as a sum of positive squares in 2 ways, for example, as 116812864 + 289068004 = 10808^2 + 17002^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1749371 + ... + 1749602.

It is an arithmetic number, because the mean of its divisors is an integer number (61232045).

Almost surely, 2^405880868 is an apocalyptic number.

It is an amenable number.

405880868 is a deficient number, since it is larger than the sum of its proper divisors (328903672).

405880868 is a wasteful number, since it uses less digits than its factorization.

405880868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3499006 (or 3499004 counting only the distinct ones).

The product of its (nonzero) digits is 491520, while the sum is 47.

The square root of 405880868 is about 20146.4852517753. The cubic root of 405880868 is about 740.3996307473.

The spelling of 405880868 in words is "four hundred five million, eight hundred eighty thousand, eight hundred sixty-eight".