40621661 has 4 divisors (see below), whose sum is σ = 40636992. Its totient is φ = 40606332.

The previous prime is 40621621. The next prime is 40621667. The reversal of 40621661 is 16612604.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 40621661 - 2²² = 36427357 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 40621661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40621667) 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, 2555 + ... + 9368.

It is an arithmetic number, because the mean of its divisors is an integer number (10159248).

Almost surely, 2^40621661 is an apocalyptic number.

It is an amenable number.

40621661 is a deficient number, since it is larger than the sum of its proper divisors (15331).

40621661 is a wasteful number, since it uses less digits than its factorization.

40621661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15330.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 40621661 is about 6373.5124538986. The cubic root of 40621661 is about 343.7577983465.

The spelling of 40621661 in words is "forty million, six hundred twenty-one thousand, six hundred sixty-one".