7940057 has 4 divisors (see below), whose sum is σ = 7963956. Its totient is φ = 7916160.

The previous prime is 7940047. The next prime is 7940063. The reversal of 7940057 is 7500497.

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 1893376 + 6046681 = 1376^2 + 2459^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7940057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7940017) 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, 11444 + ... + 12117.

It is an arithmetic number, because the mean of its divisors is an integer number (1990989).

Almost surely, 2^7940057 is an apocalyptic number.

It is an amenable number.

7940057 is a deficient number, since it is larger than the sum of its proper divisors (23899).

7940057 is a wasteful number, since it uses less digits than its factorization.

7940057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23898.

The product of its (nonzero) digits is 8820, while the sum is 32.

The square root of 7940057 is about 2817.8106749745. The cubic root of 7940057 is about 199.4992221543.

The spelling of 7940057 in words is "seven million, nine hundred forty thousand, fifty-seven".