40188669 has 4 divisors (see below), whose sum is σ = 53584896. Its totient is φ = 26792444.

The previous prime is 40188661. The next prime is 40188671. The reversal of 40188669 is 96688104.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 40188669 - 2³ = 40188661 is a prime.

It is a super-2 number, since 2×40188669² = 3230258231983122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 40188669.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40188661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6698109 + ... + 6698114.

It is an arithmetic number, because the mean of its divisors is an integer number (13396224).

Almost surely, 2^40188669 is an apocalyptic number.

It is an amenable number.

40188669 is a deficient number, since it is larger than the sum of its proper divisors (13396227).

40188669 is a wasteful number, since it uses less digits than its factorization.

40188669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13396226.

The product of its (nonzero) digits is 82944, while the sum is 42.

The square root of 40188669 is about 6339.4533676020. The cubic root of 40188669 is about 342.5320452372.

The spelling of 40188669 in words is "forty million, one hundred eighty-eight thousand, six hundred sixty-nine".