402685787 has 4 divisors (see below), whose sum is σ = 460212336. Its totient is φ = 345159240.

The previous prime is 402685781. The next prime is 402685799. The reversal of 402685787 is 787586204.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 402685787 - 2⁸ = 402685531 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (402685781) 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, 28763264 + ... + 28763277.

It is an arithmetic number, because the mean of its divisors is an integer number (115053084).

Almost surely, 2^402685787 is an apocalyptic number.

402685787 is a deficient number, since it is larger than the sum of its proper divisors (57526549).

402685787 is an equidigital number, since it uses as much as digits as its factorization.

402685787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57526548.

The product of its (nonzero) digits is 752640, while the sum is 47.

The square root of 402685787 is about 20067.0323416294. The cubic root of 402685787 is about 738.4517098382.

The spelling of 402685787 in words is "four hundred two million, six hundred eighty-five thousand, seven hundred eighty-seven".