40440997 has 4 divisors (see below), whose sum is σ = 40480960. Its totient is φ = 40401036.

The previous prime is 40440947. The next prime is 40441007. The reversal of 40440997 is 79904404.

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 a cyclic number.

It is not a de Polignac number, because 40440997 - 2¹¹ = 40438949 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40440947) 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, 18423 + ... + 20500.

It is an arithmetic number, because the mean of its divisors is an integer number (10120240).

Almost surely, 2^40440997 is an apocalyptic number.

It is an amenable number.

40440997 is a deficient number, since it is larger than the sum of its proper divisors (39963).

40440997 is a wasteful number, since it uses less digits than its factorization.

40440997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39962.

The product of its (nonzero) digits is 36288, while the sum is 37.

The square root of 40440997 is about 6359.3236275566. The cubic root of 40440997 is about 343.2474223940.

The spelling of 40440997 in words is "forty million, four hundred forty thousand, nine hundred ninety-seven".