40020621 has 16 divisors (see below), whose sum is σ = 56131584. Its totient is φ = 25313904.

The previous prime is 40020611. The next prime is 40020637. The reversal of 40020621 is 12602004.

It is not a de Polignac number, because 40020621 - 2¹⁵ = 39987853 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 40020621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40020611) 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, 6480 + ... + 11046.

It is an arithmetic number, because the mean of its divisors is an integer number (3508224).

Almost surely, 2^40020621 is an apocalyptic number.

It is an amenable number.

40020621 is a deficient number, since it is larger than the sum of its proper divisors (16110963).

40020621 is a wasteful number, since it uses less digits than its factorization.

40020621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4720.

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 40020621 is about 6326.1853434752. The cubic root of 40020621 is about 342.0539482626.

Adding to 40020621 its reverse (12602004), we get a palindrome (52622625).

The spelling of 40020621 in words is "forty million, twenty thousand, six hundred twenty-one".