406660815 has 72 divisors (see below), whose sum is σ = 804362832. Its totient is φ = 188474880.

The previous prime is 406660729. The next prime is 406660829. The reversal of 406660815 is 518066604.

It is not a de Polignac number, because 406660815 - 2⁸ = 406660559 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 406660815.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 261079 + ... + 262631.

It is an arithmetic number, because the mean of its divisors is an integer number (11171706).

Almost surely, 2^406660815 is an apocalyptic number.

406660815 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

406660815 is a deficient number, since it is larger than the sum of its proper divisors (397702017).

406660815 is a wasteful number, since it uses less digits than its factorization.

406660815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1621 (or 1595 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The square root of 406660815 is about 20165.8328615507. The cubic root of 406660815 is about 740.8735817818.

The spelling of 406660815 in words is "four hundred six million, six hundred sixty thousand, eight hundred fifteen".