40391869 has 4 divisors (see below), whose sum is σ = 46162144. Its totient is φ = 34621596.

The previous prime is 40391843. The next prime is 40391873. The reversal of 40391869 is 96819304.

40391869 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 40391869 - 2¹³ = 40383677 is a prime.

It is a super-2 number, since 2×40391869² = 3263006162626322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40391839) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2885127 + ... + 2885140.

It is an arithmetic number, because the mean of its divisors is an integer number (11540536).

Almost surely, 2^40391869 is an apocalyptic number.

It is an amenable number.

40391869 is a deficient number, since it is larger than the sum of its proper divisors (5770275).

40391869 is an equidigital number, since it uses as much as digits as its factorization.

40391869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5770274.

The product of its (nonzero) digits is 46656, while the sum is 40.

The square root of 40391869 is about 6355.4597788044. The cubic root of 40391869 is about 343.1083729666.

The spelling of 40391869 in words is "forty million, three hundred ninety-one thousand, eight hundred sixty-nine".