40243637 has 4 divisors (see below), whose sum is σ = 45992736. Its totient is φ = 34494540.

The previous prime is 40243631. The next prime is 40243661. The reversal of 40243637 is 73634204.

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 40243637 - 2¹⁰ = 40242613 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40243631) 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, 2874539 + ... + 2874552.

It is an arithmetic number, because the mean of its divisors is an integer number (11498184).

Almost surely, 2^40243637 is an apocalyptic number.

It is an amenable number.

40243637 is a deficient number, since it is larger than the sum of its proper divisors (5749099).

40243637 is an equidigital number, since it uses as much as digits as its factorization.

40243637 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5749098.

The product of its (nonzero) digits is 12096, while the sum is 29.

The square root of 40243637 is about 6343.7872757526. The cubic root of 40243637 is about 342.6881400132.

The spelling of 40243637 in words is "forty million, two hundred forty-three thousand, six hundred thirty-seven".