402639827 has 4 divisors (see below), whose sum is σ = 407163960. Its totient is φ = 398115696.

The previous prime is 402639821. The next prime is 402639841. The reversal of 402639827 is 728936204.

It is a happy number.

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 402639827 - 2¹² = 402635731 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (402639821) 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, 2261933 + ... + 2262110.

It is an arithmetic number, because the mean of its divisors is an integer number (101790990).

Almost surely, 2^402639827 is an apocalyptic number.

402639827 is a deficient number, since it is larger than the sum of its proper divisors (4524133).

402639827 is an equidigital number, since it uses as much as digits as its factorization.

402639827 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4524132.

The product of its (nonzero) digits is 145152, while the sum is 41.

The square root of 402639827 is about 20065.8871470962. The cubic root of 402639827 is about 738.4236147055.

The spelling of 402639827 in words is "four hundred two million, six hundred thirty-nine thousand, eight hundred twenty-seven".