40013537 has 4 divisors (see below), whose sum is σ = 41753280. Its totient is φ = 38273796.

The previous prime is 40013507. The next prime is 40013551. The reversal of 40013537 is 73531004.

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 40013537 - 2¹² = 40009441 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23), and also a Moran number because the ratio is a prime number: 1739719 = 40013537 / (4 + 0 + 0 + 1 + 3 + 5 + 3 + 7).

It is not an unprimeable number, because it can be changed into a prime (40013507) 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, 869837 + ... + 869882.

It is an arithmetic number, because the mean of its divisors is an integer number (10438320).

Almost surely, 2^40013537 is an apocalyptic number.

It is an amenable number.

40013537 is a deficient number, since it is larger than the sum of its proper divisors (1739743).

40013537 is a wasteful number, since it uses less digits than its factorization.

40013537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1739742.

The product of its (nonzero) digits is 1260, while the sum is 23.

The square root of 40013537 is about 6325.6254236241. The cubic root of 40013537 is about 342.0337648913.

The spelling of 40013537 in words is "forty million, thirteen thousand, five hundred thirty-seven".