40042869 has 4 divisors (see below), whose sum is σ = 53390496. Its totient is φ = 26695244.

The previous prime is 40042853. The next prime is 40042883. The reversal of 40042869 is 96824004.

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 40042869 - 2⁴ = 40042853 is a prime.

It is a super-2 number, since 2×40042869² = 3206862715502322, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40042819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6673809 + ... + 6673814.

It is an arithmetic number, because the mean of its divisors is an integer number (13347624).

Almost surely, 2^40042869 is an apocalyptic number.

It is an amenable number.

40042869 is a deficient number, since it is larger than the sum of its proper divisors (13347627).

40042869 is a wasteful number, since it uses less digits than its factorization.

40042869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13347626.

The product of its (nonzero) digits is 13824, while the sum is 33.

The square root of 40042869 is about 6327.9435048047. The cubic root of 40042869 is about 342.1173206468.

The spelling of 40042869 in words is "forty million, forty-two thousand, eight hundred sixty-nine".