402321645 has 48 divisors (see below), whose sum is σ = 776984832. Its totient is φ = 190903680.

The previous prime is 402321629. The next prime is 402321671. The reversal of 402321645 is 546123204.

402321645 is a `hidden beast` number, since 402 + 3 + 216 + 45 = 666.

It is not a de Polignac number, because 402321645 - 2⁴ = 402321629 is a prime.

It is a super-3 number, since 3×402321645³ (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 47 ways as a sum of consecutive naturals, for example, 14619 + ... + 31911.

It is an arithmetic number, because the mean of its divisors is an integer number (16187184).

Almost surely, 2^402321645 is an apocalyptic number.

402321645 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

402321645 is a deficient number, since it is larger than the sum of its proper divisors (374663187).

402321645 is a wasteful number, since it uses less digits than its factorization.

402321645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17362 (or 17359 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

The square root of 402321645 is about 20057.9571492214. The cubic root of 402321645 is about 738.2290528798.

Adding to 402321645 its reverse (546123204), we get a palindrome (948444849).

The spelling of 402321645 in words is "four hundred two million, three hundred twenty-one thousand, six hundred forty-five".