404421645 has 16 divisors (see below), whose sum is σ = 647412480. Its totient is φ = 215578944.

The previous prime is 404421637. The next prime is 404421659. The reversal of 404421645 is 546124404.

It is a happy number.

It is not a de Polignac number, because 404421645 - 2³ = 404421637 is a prime.

It is a super-3 number, since 3×404421645³ (a number of 27 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28411 + ... + 40199.

It is an arithmetic number, because the mean of its divisors is an integer number (40463280).

Almost surely, 2^404421645 is an apocalyptic number.

It is an amenable number.

404421645 is a deficient number, since it is larger than the sum of its proper divisors (242990835).

404421645 is a wasteful number, since it uses less digits than its factorization.

404421645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14084.

The product of its (nonzero) digits is 15360, while the sum is 30.

The square root of 404421645 is about 20110.2373183411. The cubic root of 404421645 is about 739.5112703036.

The spelling of 404421645 in words is "four hundred four million, four hundred twenty-one thousand, six hundred forty-five".