40365021 has 16 divisors (see below), whose sum is σ = 57841344. Its totient is φ = 24946944.

The previous prime is 40365019. The next prime is 40365041. The reversal of 40365021 is 12056304.

It is a happy number.

It is not a de Polignac number, because 40365021 - 2¹ = 40365019 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40365041) 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, 2490 + ... + 9323.

It is an arithmetic number, because the mean of its divisors is an integer number (3615084).

Almost surely, 2^40365021 is an apocalyptic number.

It is an amenable number.

40365021 is a deficient number, since it is larger than the sum of its proper divisors (17476323).

40365021 is a wasteful number, since it uses less digits than its factorization.

40365021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11900.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 40365021 is about 6353.3472280366. The cubic root of 40365021 is about 343.0323360845.

The spelling of 40365021 in words is "forty million, three hundred sixty-five thousand, twenty-one".