39670691 has 2 divisors, whose sum is σ = 39670692. Its totient is φ = 39670690.

The previous prime is 39670661. The next prime is 39670703. The reversal of 39670691 is 19607693.

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-39670691 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (39670661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19835345 + 19835346.

It is an arithmetic number, because the mean of its divisors is an integer number (19835346).

Almost surely, 2^39670691 is an apocalyptic number.

39670691 is a deficient number, since it is larger than the sum of its proper divisors (1).

39670691 is an equidigital number, since it uses as much as digits as its factorization.

39670691 is an evil number, because the sum of its binary digits is even.

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

The square root of 39670691 is about 6298.4673532535. The cubic root of 39670691 is about 341.0540845235.

The spelling of 39670691 in words is "thirty-nine million, six hundred seventy thousand, six hundred ninety-one".