404640651 has 4 divisors (see below), whose sum is σ = 539520872. Its totient is φ = 269760432.

The previous prime is 404640619. The next prime is 404640659. The reversal of 404640651 is 156046404.

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

It is not a de Polignac number, because 404640651 - 2⁵ = 404640619 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (404640659) 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, 67440106 + ... + 67440111.

It is an arithmetic number, because the mean of its divisors is an integer number (134880218).

Almost surely, 2^404640651 is an apocalyptic number.

404640651 is a deficient number, since it is larger than the sum of its proper divisors (134880221).

404640651 is a wasteful number, since it uses less digits than its factorization.

404640651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134880220.

The product of its (nonzero) digits is 11520, while the sum is 30.

The square root of 404640651 is about 20115.6817185001. The cubic root of 404640651 is about 739.6447351179.

The spelling of 404640651 in words is "four hundred four million, six hundred forty thousand, six hundred fifty-one".