40745621 has 16 divisors (see below), whose sum is σ = 48627840. Its totient is φ = 33410880.

The previous prime is 40745597. The next prime is 40745641. The reversal of 40745621 is 12654704.

It is a cyclic number.

It is not a de Polignac number, because 40745621 - 2¹⁴ = 40729237 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40745641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14510 + ... + 17088.

It is an arithmetic number, because the mean of its divisors is an integer number (3039240).

Almost surely, 2^40745621 is an apocalyptic number.

It is an amenable number.

40745621 is a deficient number, since it is larger than the sum of its proper divisors (7882219).

40745621 is a wasteful number, since it uses less digits than its factorization.

40745621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2684.

The product of its (nonzero) digits is 6720, while the sum is 29.

The square root of 40745621 is about 6383.2296684359. The cubic root of 40745621 is about 344.1071107100.

The spelling of 40745621 in words is "forty million, seven hundred forty-five thousand, six hundred twenty-one".