40647797 has 4 divisors (see below), whose sum is σ = 40699596. Its totient is φ = 40596000.

The previous prime is 40647773. The next prime is 40647823. The reversal of 40647797 is 79774604.

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

It can be written as a sum of positive squares in 2 ways, for example, as 26615281 + 14032516 = 5159^2 + 3746^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40647797 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 (40647097) 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, 24704 + ... + 26297.

It is an arithmetic number, because the mean of its divisors is an integer number (10174899).

Almost surely, 2^40647797 is an apocalyptic number.

It is an amenable number.

40647797 is a deficient number, since it is larger than the sum of its proper divisors (51799).

40647797 is an equidigital number, since it uses as much as digits as its factorization.

40647797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51798.

The product of its (nonzero) digits is 296352, while the sum is 44.

The square root of 40647797 is about 6375.5624849891. The cubic root of 40647797 is about 343.8315071956.

The spelling of 40647797 in words is "forty million, six hundred forty-seven thousand, seven hundred ninety-seven".