40136869 has 4 divisors (see below), whose sum is σ = 40156096. Its totient is φ = 40117644.

The previous prime is 40136867. The next prime is 40136903. The reversal of 40136869 is 96863104.

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 40136869 - 2¹ = 40136867 is a prime.

It is a super-2 number, since 2×40136869² = 3221936506246322, 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 (40136861) 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, 6039 + ... + 10804.

It is an arithmetic number, because the mean of its divisors is an integer number (10039024).

Almost surely, 2^40136869 is an apocalyptic number.

It is an amenable number.

40136869 is a deficient number, since it is larger than the sum of its proper divisors (19227).

40136869 is a wasteful number, since it uses less digits than its factorization.

40136869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19226.

The product of its (nonzero) digits is 31104, while the sum is 37.

The square root of 40136869 is about 6335.3665245193. The cubic root of 40136869 is about 342.3848164368.

The spelling of 40136869 in words is "forty million, one hundred thirty-six thousand, eight hundred sixty-nine".