39697221 has 8 divisors (see below), whose sum is σ = 53064544. Its totient is φ = 26397360.

The previous prime is 39697219. The next prime is 39697223. The reversal of 39697221 is 12279693.

It is an interprime number because it is at equal distance from previous prime (39697219) and next prime (39697223).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 39697221 - 2¹ = 39697219 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 39697221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39697223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15475 + ... + 17856.

It is an arithmetic number, because the mean of its divisors is an integer number (6633068).

Almost surely, 2^39697221 is an apocalyptic number.

It is an amenable number.

39697221 is a deficient number, since it is larger than the sum of its proper divisors (13367323).

39697221 is a wasteful number, since it uses less digits than its factorization.

39697221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33731.

The product of its digits is 40824, while the sum is 39.

The square root of 39697221 is about 6300.5730691739. The cubic root of 39697221 is about 341.1300948675.

The spelling of 39697221 in words is "thirty-nine million, six hundred ninety-seven thousand, two hundred twenty-one".