402661505 has 8 divisors (see below), whose sum is σ = 487885632. Its totient is φ = 319001328.

The previous prime is 402661481. The next prime is 402661517. The reversal of 402661505 is 505166204.

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 402661505 - 2⁸ = 402661249 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 390419 + ... + 391448.

It is an arithmetic number, because the mean of its divisors is an integer number (60985704).

Almost surely, 2^402661505 is an apocalyptic number.

It is an amenable number.

402661505 is a deficient number, since it is larger than the sum of its proper divisors (85224127).

402661505 is a wasteful number, since it uses less digits than its factorization.

402661505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 781975.

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 402661505 is about 20066.4273103111. The cubic root of 402661505 is about 738.4368666317.

The spelling of 402661505 in words is "four hundred two million, six hundred sixty-one thousand, five hundred five".