40655646 has 36 divisors (see below), whose sum is σ = 89702496. Its totient is φ = 13307760.

The previous prime is 40655639. The next prime is 40655701. The reversal of 40655646 is 64655604.

It is a happy number.

40655646 is a `hidden beast` number, since 4 + 0 + 6 + 5 + 5 + 646 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 40655646.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 66675 + ... + 67281.

It is an arithmetic number, because the mean of its divisors is an integer number (2491736).

Almost surely, 2^40655646 is an apocalyptic number.

40655646 is an abundant number, since it is smaller than the sum of its proper divisors (49046850).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

40655646 is a wasteful number, since it uses less digits than its factorization.

40655646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 737 (or 673 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 36.

The square root of 40655646 is about 6376.1780088075. The cubic root of 40655646 is about 343.8536368066.

The spelling of 40655646 in words is "forty million, six hundred fifty-five thousand, six hundred forty-six".