40897709 has 4 divisors (see below), whose sum is σ = 43050240. Its totient is φ = 38745180.

The previous prime is 40897673. The next prime is 40897729. The reversal of 40897709 is 90779804.

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 not a de Polignac number, because 40897709 - 2²⁴ = 24120493 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 40897709.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40897729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1076237 + ... + 1076274.

It is an arithmetic number, because the mean of its divisors is an integer number (10762560).

Almost surely, 2^40897709 is an apocalyptic number.

It is an amenable number.

40897709 is a deficient number, since it is larger than the sum of its proper divisors (2152531).

40897709 is a wasteful number, since it uses less digits than its factorization.

40897709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2152530.

The product of its (nonzero) digits is 127008, while the sum is 44.

The square root of 40897709 is about 6395.1316640082. The cubic root of 40897709 is about 344.5347197031.

The spelling of 40897709 in words is "forty million, eight hundred ninety-seven thousand, seven hundred nine".