40404399 has 16 divisors (see below), whose sum is σ = 64246272. Its totient is φ = 22084128.

The previous prime is 40404389. The next prime is 40404409. The reversal of 40404399 is 99340404.

It is a happy number.

40404399 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (40404389) and next prime (40404409).

It is not a de Polignac number, because 40404399 - 2⁴ = 40404383 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40404319) 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 15 ways as a sum of consecutive naturals, for example, 41344 + ... + 42309.

It is an arithmetic number, because the mean of its divisors is an integer number (4015392).

Almost surely, 2^40404399 is an apocalyptic number.

40404399 is a deficient number, since it is larger than the sum of its proper divisors (23841873).

40404399 is a wasteful number, since it uses less digits than its factorization.

40404399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83686.

The product of its (nonzero) digits is 15552, while the sum is 33.

The square root of 40404399 is about 6356.4454689708. The cubic root of 40404399 is about 343.1438479565.

The spelling of 40404399 in words is "forty million, four hundred four thousand, three hundred ninety-nine".