40400447 has 4 divisors (see below), whose sum is σ = 40413240. Its totient is φ = 40387656.

The previous prime is 40400431. The next prime is 40400453. The reversal of 40400447 is 74400404.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 40400447 - 2⁴ = 40400431 is a prime.

It is a super-2 number, since 2×40400447² = 3264392235599618, 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 (40400417) 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, 2129 + ... + 9237.

It is an arithmetic number, because the mean of its divisors is an integer number (10103310).

Almost surely, 2^40400447 is an apocalyptic number.

40400447 is a deficient number, since it is larger than the sum of its proper divisors (12793).

40400447 is an equidigital number, since it uses as much as digits as its factorization.

40400447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12792.

The product of its (nonzero) digits is 1792, while the sum is 23.

The square root of 40400447 is about 6356.1345958059. The cubic root of 40400447 is about 343.1326598290.

The spelling of 40400447 in words is "forty million, four hundred thousand, four hundred forty-seven".