7640999 has 2 divisors, whose sum is σ = 7641000. Its totient is φ = 7640998.

The previous prime is 7640993. The next prime is 7641001. The reversal of 7640999 is 9990467.

It is a strong prime.

It is an emirp because it is prime and its reverse (9990467) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7640999 - 2²⁰ = 6592423 is a prime.

Together with 7641001, it forms a pair of twin primes.

It is a Chen prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7640993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3820499 + 3820500.

It is an arithmetic number, because the mean of its divisors is an integer number (3820500).

Almost surely, 2^7640999 is an apocalyptic number.

7640999 is a deficient number, since it is larger than the sum of its proper divisors (1).

7640999 is an equidigital number, since it uses as much as digits as its factorization.

7640999 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 122472, while the sum is 44.

The square root of 7640999 is about 2764.2356990676. The cubic root of 7640999 is about 196.9624242280.

The spelling of 7640999 in words is "seven million, six hundred forty thousand, nine hundred ninety-nine".