402804901 has 4 divisors (see below), whose sum is σ = 403809804. Its totient is φ = 401800000.

The previous prime is 402804863. The next prime is 402804923. The reversal of 402804901 is 109408204.

It is a Cunningham number, because it is equal to 20070²+1.

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

It can be written as a sum of positive squares in 2 ways, for example, as 398800900 + 4004001 = 19970^2 + 2001^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-402804901 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 402804901.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402804931) 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, 501850 + ... + 502651.

It is an arithmetic number, because the mean of its divisors is an integer number (100952451).

Almost surely, 2^402804901 is an apocalyptic number.

It is an amenable number.

402804901 is a deficient number, since it is larger than the sum of its proper divisors (1004903).

402804901 is a wasteful number, since it uses less digits than its factorization.

402804901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1004902.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 402804901 is about 20070.0000249128. Note that the first 4 decimals coincide. The cubic root of 402804901 is about 738.5245137202.

The spelling of 402804901 in words is "four hundred two million, eight hundred four thousand, nine hundred one".