402688901 has 4 divisors (see below), whose sum is σ = 402730272. Its totient is φ = 402647532.

The previous prime is 402688879. The next prime is 402688967. The reversal of 402688901 is 109886204.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 402688901 - 2¹⁸ = 402426757 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402688001) 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, 2816 + ... + 28518.

It is an arithmetic number, because the mean of its divisors is an integer number (100682568).

Almost surely, 2^402688901 is an apocalyptic number.

It is an amenable number.

402688901 is a deficient number, since it is larger than the sum of its proper divisors (41371).

402688901 is a wasteful number, since it uses less digits than its factorization.

402688901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41370.

The product of its (nonzero) digits is 27648, while the sum is 38.

The square root of 402688901 is about 20067.1099314276. The cubic root of 402688901 is about 738.4536133345.

The spelling of 402688901 in words is "four hundred two million, six hundred eighty-eight thousand, nine hundred one".