39240991 has 2 divisors, whose sum is σ = 39240992. Its totient is φ = 39240990.

The previous prime is 39240961. The next prime is 39241001. The reversal of 39240991 is 19904293.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 39240991 - 2¹³ = 39232799 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 39240991.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39240961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19620495 + 19620496.

It is an arithmetic number, because the mean of its divisors is an integer number (19620496).

Almost surely, 2^39240991 is an apocalyptic number.

39240991 is a deficient number, since it is larger than the sum of its proper divisors (1).

39240991 is an equidigital number, since it uses as much as digits as its factorization.

39240991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17496, while the sum is 37.

The square root of 39240991 is about 6264.2630053343. The cubic root of 39240991 is about 339.8182159737.

The spelling of 39240991 in words is "thirty-nine million, two hundred forty thousand, nine hundred ninety-one".