7661939 has 2 divisors, whose sum is σ = 7661940. Its totient is φ = 7661938.

The previous prime is 7661903. The next prime is 7661947. The reversal of 7661939 is 9391667.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7661939 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 7661896 and 7661905.

It is not a weakly prime, because it can be changed into another prime (7661989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3830969 + 3830970.

It is an arithmetic number, because the mean of its divisors is an integer number (3830970).

Almost surely, 2^7661939 is an apocalyptic number.

7661939 is a deficient number, since it is larger than the sum of its proper divisors (1).

7661939 is an equidigital number, since it uses as much as digits as its factorization.

7661939 is an evil number, because the sum of its binary digits is even.

The product of its digits is 61236, while the sum is 41.

The square root of 7661939 is about 2768.0207730434. The cubic root of 7661939 is about 197.1421839376.

The spelling of 7661939 in words is "seven million, six hundred sixty-one thousand, nine hundred thirty-nine".