402638903 has 4 divisors (see below), whose sum is σ = 405203640. Its totient is φ = 400074168.

The previous prime is 402638879. The next prime is 402638909. The reversal of 402638903 is 309836204.

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 402638903 - 2⁶ = 402638839 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402638909) 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, 1282133 + ... + 1282446.

It is an arithmetic number, because the mean of its divisors is an integer number (101300910).

Almost surely, 2^402638903 is an apocalyptic number.

402638903 is a deficient number, since it is larger than the sum of its proper divisors (2564737).

402638903 is a wasteful number, since it uses less digits than its factorization.

402638903 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2564736.

The product of its (nonzero) digits is 31104, while the sum is 35.

The square root of 402638903 is about 20065.8641229328. The cubic root of 402638903 is about 738.4230498467.

The spelling of 402638903 in words is "four hundred two million, six hundred thirty-eight thousand, nine hundred three".