402820857 has 12 divisors (see below), whose sum is σ = 603402800. Its totient is φ = 268547076.

The previous prime is 402820841. The next prime is 402820871. The reversal of 402820857 is 758028204.

It is a happy number.

It is not a de Polignac number, because 402820857 - 2⁴ = 402820841 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (402820057) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 828607 + ... + 829092.

Almost surely, 2^402820857 is an apocalyptic number.

It is an amenable number.

402820857 is a deficient number, since it is larger than the sum of its proper divisors (200581943).

402820857 is an equidigital number, since it uses as much as digits as its factorization.

402820857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1657714 (or 1657702 counting only the distinct ones).

The product of its (nonzero) digits is 35840, while the sum is 36.

The square root of 402820857 is about 20070.3975296953. The cubic root of 402820857 is about 738.5342651255.

The spelling of 402820857 in words is "four hundred two million, eight hundred twenty thousand, eight hundred fifty-seven".