40401644 has 12 divisors (see below), whose sum is σ = 70761768. Its totient is φ = 20184000.

The previous prime is 40401643. The next prime is 40401659. The reversal of 40401644 is 44610404.

It is not an unprimeable number, because it can be changed into a prime (40401643) 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, 2324 + ... + 9284.

It is an arithmetic number, because the mean of its divisors is an integer number (5896814).

Almost surely, 2^40401644 is an apocalyptic number.

It is an amenable number.

40401644 is a deficient number, since it is larger than the sum of its proper divisors (30360124).

40401644 is a wasteful number, since it uses less digits than its factorization.

40401644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8416 (or 8414 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 23.

The square root of 40401644 is about 6356.2287561100. The cubic root of 40401644 is about 343.1360486177.

The spelling of 40401644 in words is "forty million, four hundred one thousand, six hundred forty-four".