40644427 has 4 divisors (see below), whose sum is σ = 42411600. Its totient is φ = 38877256.

The previous prime is 40644421. The next prime is 40644437. The reversal of 40644427 is 72444604.

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

It is a cyclic number.

It is not a de Polignac number, because 40644427 - 2⁷ = 40644299 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40644421) 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, 883552 + ... + 883597.

It is an arithmetic number, because the mean of its divisors is an integer number (10602900).

Almost surely, 2^40644427 is an apocalyptic number.

40644427 is a deficient number, since it is larger than the sum of its proper divisors (1767173).

40644427 is a wasteful number, since it uses less digits than its factorization.

40644427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1767172.

The product of its (nonzero) digits is 21504, while the sum is 31.

The square root of 40644427 is about 6375.2981891046. The cubic root of 40644427 is about 343.8220048831.

The spelling of 40644427 in words is "forty million, six hundred forty-four thousand, four hundred twenty-seven".