39660091 has 4 divisors (see below), whose sum is σ = 40105800. Its totient is φ = 39214384.

The previous prime is 39660017. The next prime is 39660107. The reversal of 39660091 is 19006693.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 39660091 - 2⁹ = 39659579 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (39667091) 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, 222721 + ... + 222898.

It is an arithmetic number, because the mean of its divisors is an integer number (10026450).

Almost surely, 2^39660091 is an apocalyptic number.

39660091 is a deficient number, since it is larger than the sum of its proper divisors (445709).

39660091 is an equidigital number, since it uses as much as digits as its factorization.

39660091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 445708.

The product of its (nonzero) digits is 8748, while the sum is 34.

The square root of 39660091 is about 6297.6258224826. The cubic root of 39660091 is about 341.0237052918.

The spelling of 39660091 in words is "thirty-nine million, six hundred sixty thousand, ninety-one".