40404739 has 4 divisors (see below), whose sum is σ = 40454424. Its totient is φ = 40355056.

The previous prime is 40404667. The next prime is 40404757. The reversal of 40404739 is 93740404.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 40404739 - 2²¹ = 38307587 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 40404739.

It is not an unprimeable number, because it can be changed into a prime (40404779) 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, 23602 + ... + 25255.

It is an arithmetic number, because the mean of its divisors is an integer number (10113606).

Almost surely, 2^40404739 is an apocalyptic number.

40404739 is a deficient number, since it is larger than the sum of its proper divisors (49685).

40404739 is an equidigital number, since it uses as much as digits as its factorization.

40404739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49684.

The product of its (nonzero) digits is 12096, while the sum is 31.

The square root of 40404739 is about 6356.4722134215. The cubic root of 40404739 is about 343.1448104638.

The spelling of 40404739 in words is "forty million, four hundred four thousand, seven hundred thirty-nine".