7940257 has 8 divisors (see below), whose sum is σ = 8574440. Its totient is φ = 7309440.

The previous prime is 7940249. The next prime is 7940269. The reversal of 7940257 is 7520497.

It can be written as a sum of positive squares in 4 ways, for example, as 77841 + 7862416 = 279^2 + 2804^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 7940257 - 2³ = 7940249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7940357) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6469 + ... + 7597.

It is an arithmetic number, because the mean of its divisors is an integer number (1071805).

Almost surely, 2^7940257 is an apocalyptic number.

It is an amenable number.

7940257 is a deficient number, since it is larger than the sum of its proper divisors (634183).

7940257 is a wasteful number, since it uses less digits than its factorization.

7940257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1683.

The product of its (nonzero) digits is 17640, while the sum is 34.

The square root of 7940257 is about 2817.8461632956. The cubic root of 7940257 is about 199.5008971846.

The spelling of 7940257 in words is "seven million, nine hundred forty thousand, two hundred fifty-seven".