36405631 has 8 divisors (see below), whose sum is σ = 36789984. Its totient is φ = 36023520.

The previous prime is 36405623. The next prime is 36405637. The reversal of 36405631 is 13650463.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 36405631 - 2³ = 36405623 is a prime.

It is a super-2 number, since 2×36405631² = 2650739937016322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 36405631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (36405637) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 72126 + ... + 72628.

It is an arithmetic number, because the mean of its divisors is an integer number (4598748).

Almost surely, 2^36405631 is an apocalyptic number.

36405631 is a deficient number, since it is larger than the sum of its proper divisors (384353).

36405631 is a wasteful number, since it uses less digits than its factorization.

36405631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1121.

The product of its (nonzero) digits is 6480, while the sum is 28.

The square root of 36405631 is about 6033.7078981336. The cubic root of 36405631 is about 331.4282479135.

The spelling of 36405631 in words is "thirty-six million, four hundred five thousand, six hundred thirty-one".