39993749 has 2 divisors, whose sum is σ = 39993750. Its totient is φ = 39993748.

The previous prime is 39993731. The next prime is 39993763. The reversal of 39993749 is 94739993.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26853124 + 13140625 = 5182^2 + 3625^2 .

It is a cyclic number.

It is not a de Polignac number, because 39993749 - 2⁸ = 39993493 is a prime.

It is a plaindrome in base 15.

It is a self number, because there is not a number n which added to its sum of digits gives 39993749.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39993769) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19996874 + 19996875.

It is an arithmetic number, because the mean of its divisors is an integer number (19996875).

Almost surely, 2^39993749 is an apocalyptic number.

It is an amenable number.

39993749 is a deficient number, since it is larger than the sum of its proper divisors (1).

39993749 is an equidigital number, since it uses as much as digits as its factorization.

39993749 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1653372, while the sum is 53.

The square root of 39993749 is about 6324.0611160867. The cubic root of 39993749 is about 341.9773733078.

The spelling of 39993749 in words is "thirty-nine million, nine hundred ninety-three thousand, seven hundred forty-nine".