402648923 has 4 divisors (see below), whose sum is σ = 406635648. Its totient is φ = 398662200.

The previous prime is 402648907. The next prime is 402648937. The reversal of 402648923 is 329846204.

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 402648923 - 2⁴ = 402648907 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (402647923) 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, 1993211 + ... + 1993412.

It is an arithmetic number, because the mean of its divisors is an integer number (101658912).

Almost surely, 2^402648923 is an apocalyptic number.

402648923 is a deficient number, since it is larger than the sum of its proper divisors (3986725).

402648923 is a wasteful number, since it uses less digits than its factorization.

402648923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3986724.

The product of its (nonzero) digits is 82944, while the sum is 38.

The square root of 402648923 is about 20066.1137991391. The cubic root of 402648923 is about 738.4291752174.

The spelling of 402648923 in words is "four hundred two million, six hundred forty-eight thousand, nine hundred twenty-three".