40138693 has 6 divisors (see below), whose sum is σ = 46692006. Its totient is φ = 34404552.

The previous prime is 40138687. The next prime is 40138699. The reversal of 40138693 is 39683104.

It is an interprime number because it is at equal distance from previous prime (40138687) and next prime (40138699).

It can be written as a sum of positive squares in only one way, i.e., 37173409 + 2965284 = 6097^2 + 1722^2 .

It is not a de Polignac number, because 40138693 - 2⁵ = 40138661 is a prime.

It is a super-2 number, since 2×40138693² = 3222229351496498, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40138699) 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, 409530 + ... + 409627.

It is an arithmetic number, because the mean of its divisors is an integer number (7782001).

Almost surely, 2^40138693 is an apocalyptic number.

It is an amenable number.

40138693 is a deficient number, since it is larger than the sum of its proper divisors (6553313).

40138693 is an equidigital number, since it uses as much as digits as its factorization.

40138693 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 819171 (or 819164 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 34.

The square root of 40138693 is about 6335.5104766704. The cubic root of 40138693 is about 342.3900028607.

The spelling of 40138693 in words is "forty million, one hundred thirty-eight thousand, six hundred ninety-three".