40631643 has 24 divisors (see below), whose sum is σ = 63488880. Its totient is φ = 24891840.

The previous prime is 40631623. The next prime is 40631677. The reversal of 40631643 is 34613604.

It is not a de Polignac number, because 40631643 - 2⁸ = 40631387 is a prime.

It is not an unprimeable number, because it can be changed into a prime (40631623) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 30828 + ... + 32118.

It is an arithmetic number, because the mean of its divisors is an integer number (2645370).

Almost surely, 2^40631643 is an apocalyptic number.

40631643 is a deficient number, since it is larger than the sum of its proper divisors (22857237).

40631643 is a wasteful number, since it uses less digits than its factorization.

40631643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1579 (or 1576 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 27.

The square root of 40631643 is about 6374.2954904836. The cubic root of 40631643 is about 343.7859533524.

The spelling of 40631643 in words is "forty million, six hundred thirty-one thousand, six hundred forty-three".