7640947 has 4 divisors (see below), whose sum is σ = 7708680. Its totient is φ = 7573216.

The previous prime is 7640933. The next prime is 7640987. The reversal of 7640947 is 7490467.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7490467 = 433 ⋅17299.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7640947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7640987) 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, 33697 + ... + 33922.

It is an arithmetic number, because the mean of its divisors is an integer number (1927170).

Almost surely, 2^7640947 is an apocalyptic number.

7640947 is a deficient number, since it is larger than the sum of its proper divisors (67733).

7640947 is a wasteful number, since it uses less digits than its factorization.

7640947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67732.

The product of its (nonzero) digits is 42336, while the sum is 37.

The square root of 7640947 is about 2764.2262931967. The cubic root of 7640947 is about 196.9619774248.

The spelling of 7640947 in words is "seven million, six hundred forty thousand, nine hundred forty-seven".