40649518 has 24 divisors (see below), whose sum is σ = 76387752. Its totient is φ = 16080624.

The previous prime is 40649513. The next prime is 40649519. The reversal of 40649518 is 81594604.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40649513) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14680 + ... + 17227.

It is an arithmetic number, because the mean of its divisors is an integer number (3182823).

Almost surely, 2^40649518 is an apocalyptic number.

40649518 is a deficient number, since it is larger than the sum of its proper divisors (35738234).

40649518 is a wasteful number, since it uses less digits than its factorization.

40649518 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31936 (or 31929 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 37.

The square root of 40649518 is about 6375.6974520440. The cubic root of 40649518 is about 343.8363596576.

The spelling of 40649518 in words is "forty million, six hundred forty-nine thousand, five hundred eighteen".