39948217 has 4 divisors (see below), whose sum is σ = 41685120. Its totient is φ = 38211316.

The previous prime is 39948193. The next prime is 39948239. The reversal of 39948217 is 71284993.

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, and also an emirpimes, since its reverse is a distinct semiprime: 71284993 = 13 ⋅5483461.

It is a cyclic number.

It is not a de Polignac number, because 39948217 - 2¹¹ = 39946169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (39948017) 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, 868417 + ... + 868462.

It is an arithmetic number, because the mean of its divisors is an integer number (10421280).

Almost surely, 2^39948217 is an apocalyptic number.

It is an amenable number.

39948217 is a deficient number, since it is larger than the sum of its proper divisors (1736903).

39948217 is a wasteful number, since it uses less digits than its factorization.

39948217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1736902.

The product of its digits is 108864, while the sum is 43.

The square root of 39948217 is about 6320.4601889419. The cubic root of 39948217 is about 341.8475461312.

The spelling of 39948217 in words is "thirty-nine million, nine hundred forty-eight thousand, two hundred seventeen".