40400669 has 4 divisors (see below), whose sum is σ = 42527040. Its totient is φ = 38274300.

The previous prime is 40400603. The next prime is 40400713. The reversal of 40400669 is 96600404.

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 40400669 - 2⁸ = 40400413 is a prime.

It is a super-2 number, since 2×40400669² = 3264428111295122, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40400069) 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, 1063157 + ... + 1063194.

It is an arithmetic number, because the mean of its divisors is an integer number (10631760).

Almost surely, 2^40400669 is an apocalyptic number.

It is an amenable number.

40400669 is a deficient number, since it is larger than the sum of its proper divisors (2126371).

40400669 is a wasteful number, since it uses less digits than its factorization.

40400669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2126370.

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 40400669 is about 6356.1520592258. The cubic root of 40400669 is about 343.1332883312.

The spelling of 40400669 in words is "forty million, four hundred thousand, six hundred sixty-nine".