40408164 has 18 divisors (see below), whose sum is σ = 102142950. Its totient is φ = 13469376.

The previous prime is 40408139. The next prime is 40408183. The reversal of 40408164 is 46180404.

It can be written as a sum of positive squares in only one way, i.e., 37822500 + 2585664 = 6150^2 + 1608^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 561189 + ... + 561260.

Almost surely, 2^40408164 is an apocalyptic number.

It is an amenable number.

40408164 is an abundant number, since it is smaller than the sum of its proper divisors (61734786).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

40408164 is a wasteful number, since it uses less digits than its factorization.

40408164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1122459 (or 1122454 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 27.

The square root of 40408164 is about 6356.7416181563. The cubic root of 40408164 is about 343.1545060077.

Adding to 40408164 its reverse (46180404), we get a palindrome (86588568).

The spelling of 40408164 in words is "forty million, four hundred eight thousand, one hundred sixty-four".