39949321 has 4 divisors (see below), whose sum is σ = 41686272. Its totient is φ = 38212372.

The previous prime is 39949319. The next prime is 39949331. The reversal of 39949321 is 12394993.

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 39949321 - 2¹ = 39949319 is a prime.

It is a super-2 number, since 2×39949321² = 3191896496722082, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (39949331) 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, 868441 + ... + 868486.

It is an arithmetic number, because the mean of its divisors is an integer number (10421568).

Almost surely, 2^39949321 is an apocalyptic number.

It is an amenable number.

39949321 is a deficient number, since it is larger than the sum of its proper divisors (1736951).

39949321 is a wasteful number, since it uses less digits than its factorization.

39949321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1736950.

The product of its digits is 52488, while the sum is 40.

The square root of 39949321 is about 6320.5475237514. The cubic root of 39949321 is about 341.8506951763.

The spelling of 39949321 in words is "thirty-nine million, nine hundred forty-nine thousand, three hundred twenty-one".