40697439 has 16 divisors (see below), whose sum is σ = 57990240. Its totient is φ = 25297920.

The previous prime is 40697401. The next prime is 40697467. The reversal of 40697439 is 93479604.

It is not a de Polignac number, because 40697439 - 2⁹ = 40696927 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 40697439.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40697339) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1899 + ... + 9219.

It is an arithmetic number, because the mean of its divisors is an integer number (3624390).

Almost surely, 2^40697439 is an apocalyptic number.

40697439 is a deficient number, since it is larger than the sum of its proper divisors (17292801).

40697439 is a wasteful number, since it uses less digits than its factorization.

40697439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7450.

The product of its (nonzero) digits is 163296, while the sum is 42.

The square root of 40697439 is about 6379.4544437593. The cubic root of 40697439 is about 343.9714208049.

The spelling of 40697439 in words is "forty million, six hundred ninety-seven thousand, four hundred thirty-nine".