40536621 has 6 divisors (see below), whose sum is σ = 58552910. Its totient is φ = 27024408.

The previous prime is 40536611. The next prime is 40536631. The reversal of 40536621 is 12663504.

40536621 is a `hidden beast` number, since 4 + 0 + 5 + 36 + 621 = 666.

It is an interprime number because it is at equal distance from previous prime (40536611) and next prime (40536631).

It can be written as a sum of positive squares in only one way, i.e., 33802596 + 6734025 = 5814^2 + 2595^2 .

It is not a de Polignac number, because 40536621 - 2¹⁴ = 40520237 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 (40536611) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2252026 + ... + 2252043.

Almost surely, 2^40536621 is an apocalyptic number.

It is an amenable number.

40536621 is a deficient number, since it is larger than the sum of its proper divisors (18016289).

40536621 is a wasteful number, since it uses less digits than its factorization.

40536621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4504075 (or 4504072 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 40536621 is about 6366.8375980545. The cubic root of 40536621 is about 343.5177491893.

The spelling of 40536621 in words is "forty million, five hundred thirty-six thousand, six hundred twenty-one".