403665645 has 16 divisors (see below), whose sum is σ = 668136960. Its totient is φ = 207864384.

The previous prime is 403665637. The next prime is 403665673. The reversal of 403665645 is 546566304.

403665645 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 403665645 - 2³ = 403665637 is a prime.

It is a super-3 number, since 3×403665645³ (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, 463549 + ... + 464418.

It is an arithmetic number, because the mean of its divisors is an integer number (41758560).

Almost surely, 2^403665645 is an apocalyptic number.

It is an amenable number.

403665645 is a deficient number, since it is larger than the sum of its proper divisors (264471315).

403665645 is a wasteful number, since it uses less digits than its factorization.

403665645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 928004.

The product of its (nonzero) digits is 259200, while the sum is 39.

The square root of 403665645 is about 20091.4321291440. The cubic root of 403665645 is about 739.0501844929.

The spelling of 403665645 in words is "four hundred three million, six hundred sixty-five thousand, six hundred forty-five".