405365645 has 4 divisors (see below), whose sum is σ = 486438780. Its totient is φ = 324292512.

The previous prime is 405365633. The next prime is 405365657. The reversal of 405365645 is 546563504.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (405365633) and next prime (405365657).

It can be written as a sum of positive squares in 2 ways, for example, as 194128489 + 211237156 = 13933^2 + 14534^2 .

It is a cyclic number.

It is not a de Polignac number, because 405365645 - 2⁶ = 405365581 is a prime.

It is a super-3 number, since 3×405365645³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a junction number, because it is equal to n+sod(n) for n = 405365599 and 405365608.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40536560 + ... + 40536569.

It is an arithmetic number, because the mean of its divisors is an integer number (121609695).

Almost surely, 2^405365645 is an apocalyptic number.

It is an amenable number.

405365645 is a deficient number, since it is larger than the sum of its proper divisors (81073135).

405365645 is an equidigital number, since it uses as much as digits as its factorization.

405365645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81073134.

The product of its (nonzero) digits is 216000, while the sum is 38.

The square root of 405365645 is about 20133.6942710472. The cubic root of 405365645 is about 740.0862116504.

The spelling of 405365645 in words is "four hundred five million, three hundred sixty-five thousand, six hundred forty-five".