40644969 has 8 divisors (see below), whose sum is σ = 54263520. Its totient is φ = 27061536.

The previous prime is 40644931. The next prime is 40644973. The reversal of 40644969 is 96944604.

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

It is not a de Polignac number, because 40644969 - 2⁸ = 40644713 is a prime.

It is a super-2 number, since 2×40644969² = 3304027010021922, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 40644969.

It is not an unprimeable number, because it can be changed into a prime (40644169) 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, 5947 + ... + 10800.

It is an arithmetic number, because the mean of its divisors is an integer number (6782940).

Almost surely, 2^40644969 is an apocalyptic number.

It is an amenable number.

40644969 is a deficient number, since it is larger than the sum of its proper divisors (13618551).

40644969 is a wasteful number, since it uses less digits than its factorization.

40644969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17559.

The product of its (nonzero) digits is 186624, while the sum is 42.

The square root of 40644969 is about 6375.3406967785. The cubic root of 40644969 is about 343.8235331836.

The spelling of 40644969 in words is "forty million, six hundred forty-four thousand, nine hundred sixty-nine".