405040657 has 8 divisors (see below), whose sum is σ = 490133376. Its totient is φ = 326755392.

The previous prime is 405040639. The next prime is 405040679. The reversal of 405040657 is 756040504.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 405040657 - 2²³ = 396652049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (405040687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1701733 + ... + 1701970.

It is an arithmetic number, because the mean of its divisors is an integer number (61266672).

Almost surely, 2^405040657 is an apocalyptic number.

It is an amenable number.

405040657 is a deficient number, since it is larger than the sum of its proper divisors (85092719).

405040657 is a wasteful number, since it uses less digits than its factorization.

405040657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3403727.

The product of its (nonzero) digits is 16800, while the sum is 31.

The square root of 405040657 is about 20125.6219034344. The cubic root of 405040657 is about 739.8883791953. Note that the first 3 decimals are identical.

The spelling of 405040657 in words is "four hundred five million, forty thousand, six hundred fifty-seven".