7940681 has 32 divisors (see below), whose sum is σ = 10272768. Its totient is φ = 5987520.

The previous prime is 7940663. The next prime is 7940707. The reversal of 7940681 is 1860497.

It is not a de Polignac number, because 7940681 - 2²² = 3746377 is a prime.

It is a super-2 number, since 2×7940681² = 126108829487522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7940641) 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 31 ways as a sum of consecutive naturals, for example, 184646 + ... + 184688.

It is an arithmetic number, because the mean of its divisors is an integer number (321024).

Almost surely, 2^7940681 is an apocalyptic number.

It is an amenable number.

7940681 is a deficient number, since it is larger than the sum of its proper divisors (2332087).

7940681 is a wasteful number, since it uses less digits than its factorization.

7940681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141.

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 7940681 is about 2817.9213970585. The cubic root of 7940681 is about 199.5044481560.

The spelling of 7940681 in words is "seven million, nine hundred forty thousand, six hundred eighty-one".