39689723 has 2 divisors, whose sum is σ = 39689724. Its totient is φ = 39689722.

The previous prime is 39689707. The next prime is 39689729. The reversal of 39689723 is 32798693.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 39689723 - 2⁴ = 39689707 is a prime.

It is a super-2 number, since 2×39689723² = 3150548223633458, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (39689729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19844861 + 19844862.

It is an arithmetic number, because the mean of its divisors is an integer number (19844862).

Almost surely, 2^39689723 is an apocalyptic number.

39689723 is a deficient number, since it is larger than the sum of its proper divisors (1).

39689723 is an equidigital number, since it uses as much as digits as its factorization.

39689723 is an evil number, because the sum of its binary digits is even.

The product of its digits is 489888, while the sum is 47.

The square root of 39689723 is about 6299.9780158347. The cubic root of 39689723 is about 341.1086159961.

The spelling of 39689723 in words is "thirty-nine million, six hundred eighty-nine thousand, seven hundred twenty-three".