39390749 has 2 divisors, whose sum is σ = 39390750. Its totient is φ = 39390748.

The previous prime is 39390733. The next prime is 39390761. The reversal of 39390749 is 94709393.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38875225 + 515524 = 6235^2 + 718^2 .

It is a cyclic number.

It is not a de Polignac number, because 39390749 - 2⁴ = 39390733 is a prime.

It is a super-2 number, since 2×39390749² = 3103262213562002, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39390779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19695374 + 19695375.

It is an arithmetic number, because the mean of its divisors is an integer number (19695375).

Almost surely, 2^39390749 is an apocalyptic number.

It is an amenable number.

39390749 is a deficient number, since it is larger than the sum of its proper divisors (1).

39390749 is an equidigital number, since it uses as much as digits as its factorization.

39390749 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 183708, while the sum is 44.

The square root of 39390749 is about 6276.2049839055. The cubic root of 39390749 is about 340.2499574858.

The spelling of 39390749 in words is "thirty-nine million, three hundred ninety thousand, seven hundred forty-nine".