39740231 has 2 divisors, whose sum is σ = 39740232. Its totient is φ = 39740230.

The previous prime is 39740189. The next prime is 39740243. The reversal of 39740231 is 13204793.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-39740231 is a prime.

It is a super-2 number, since 2×39740231² = 3158571919866722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 39740194 and 39740203.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39740531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19870115 + 19870116.

It is an arithmetic number, because the mean of its divisors is an integer number (19870116).

Almost surely, 2^39740231 is an apocalyptic number.

39740231 is a deficient number, since it is larger than the sum of its proper divisors (1).

39740231 is an equidigital number, since it uses as much as digits as its factorization.

39740231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4536, while the sum is 29.

The square root of 39740231 is about 6303.9853267596. The cubic root of 39740231 is about 341.2532496660.

The spelling of 39740231 in words is "thirty-nine million, seven hundred forty thousand, two hundred thirty-one".