39216621 has 8 divisors (see below), whose sum is σ = 52317760. Its totient is φ = 26129952.

The previous prime is 39216607. The next prime is 39216647. The reversal of 39216621 is 12661293.

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

It is not a de Polignac number, because 39216621 - 2¹⁹ = 38692333 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39216601) 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, 8841 + ... + 12513.

It is an arithmetic number, because the mean of its divisors is an integer number (6539720).

Almost surely, 2^39216621 is an apocalyptic number.

It is an amenable number.

39216621 is a deficient number, since it is larger than the sum of its proper divisors (13101139).

39216621 is a wasteful number, since it uses less digits than its factorization.

39216621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7235.

The product of its digits is 3888, while the sum is 30.

The square root of 39216621 is about 6262.3175422522. The cubic root of 39216621 is about 339.7478551542.

The spelling of 39216621 in words is "thirty-nine million, two hundred sixteen thousand, six hundred twenty-one".