40042637 has 4 divisors (see below), whose sum is σ = 40894656. Its totient is φ = 39190620.

The previous prime is 40042631. The next prime is 40042643. The reversal of 40042637 is 73624004.

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 an interprime number because it is at equal distance from previous prime (40042631) and next prime (40042643).

It is a cyclic number.

It is not a de Polignac number, because 40042637 - 2⁸ = 40042381 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 (40042631) 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, 425939 + ... + 426032.

It is an arithmetic number, because the mean of its divisors is an integer number (10223664).

Almost surely, 2^40042637 is an apocalyptic number.

40042637 is a gapful number since it is divisible by the number (47) formed by its first and last digit.

It is an amenable number.

40042637 is a deficient number, since it is larger than the sum of its proper divisors (852019).

40042637 is an equidigital number, since it uses as much as digits as its factorization.

40042637 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 852018.

The product of its (nonzero) digits is 4032, while the sum is 26.

The square root of 40042637 is about 6327.9251733882. The cubic root of 40042637 is about 342.1166599268.

The spelling of 40042637 in words is "forty million, forty-two thousand, six hundred thirty-seven".