39749217 has 4 divisors (see below), whose sum is σ = 52998960. Its totient is φ = 26499476.

The previous prime is 39749209. The next prime is 39749231. The reversal of 39749217 is 71294793.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 39749217 - 2³ = 39749209 is a prime.

It is a super-2 number, since 2×39749217² = 3160000504226178, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (39749117) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6624867 + ... + 6624872.

It is an arithmetic number, because the mean of its divisors is an integer number (13249740).

Almost surely, 2^39749217 is an apocalyptic number.

It is an amenable number.

39749217 is a deficient number, since it is larger than the sum of its proper divisors (13249743).

39749217 is a wasteful number, since it uses less digits than its factorization.

39749217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13249742.

The product of its digits is 95256, while the sum is 42.

The square root of 39749217 is about 6304.6980102143. The cubic root of 39749217 is about 341.2789689478.

The spelling of 39749217 in words is "thirty-nine million, seven hundred forty-nine thousand, two hundred seventeen".