39686421 has 8 divisors (see below), whose sum is σ = 55700320. Its totient is φ = 25065072.

The previous prime is 39686419. The next prime is 39686429. The reversal of 39686421 is 12468693.

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

It is not a de Polignac number, because 39686421 - 2¹ = 39686419 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 39686421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39686429) 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, 348070 + ... + 348183.

It is an arithmetic number, because the mean of its divisors is an integer number (6962540).

Almost surely, 2^39686421 is an apocalyptic number.

It is an amenable number.

39686421 is a deficient number, since it is larger than the sum of its proper divisors (16013899).

39686421 is a wasteful number, since it uses less digits than its factorization.

39686421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 696275.

The product of its digits is 62208, while the sum is 39.

The square root of 39686421 is about 6299.7159459772. The cubic root of 39686421 is about 341.0991561847.

The spelling of 39686421 in words is "thirty-nine million, six hundred eighty-six thousand, four hundred twenty-one".