402820851 has 16 divisors (see below), whose sum is σ = 555419648. Its totient is φ = 259416000.

The previous prime is 402820841. The next prime is 402820871. The reversal of 402820851 is 158028204.

It is not a de Polignac number, because 402820851 - 2⁶ = 402820787 is a prime.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (402820801) 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 15 ways as a sum of consecutive naturals, for example, 52290 + ... + 59496.

It is an arithmetic number, because the mean of its divisors is an integer number (34713728).

Almost surely, 2^402820851 is an apocalyptic number.

402820851 is a deficient number, since it is larger than the sum of its proper divisors (152598797).

402820851 is a wasteful number, since it uses less digits than its factorization.

402820851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7842.

The product of its (nonzero) digits is 5120, while the sum is 30.

The square root of 402820851 is about 20070.3973802214. The cubic root of 402820851 is about 738.5342614587.

The spelling of 402820851 in words is "four hundred two million, eight hundred twenty thousand, eight hundred fifty-one".