39683421 has 6 divisors (see below), whose sum is σ = 57320510. Its totient is φ = 26455608.

The previous prime is 39683417. The next prime is 39683431. The reversal of 39683421 is 12438693.

It can be written as a sum of positive squares in only one way, i.e., 37088100 + 2595321 = 6090^2 + 1611^2 .

It is not a de Polignac number, because 39683421 - 2² = 39683417 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 (39683431) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2204626 + ... + 2204643.

Almost surely, 2^39683421 is an apocalyptic number.

It is an amenable number.

39683421 is a deficient number, since it is larger than the sum of its proper divisors (17637089).

39683421 is a wasteful number, since it uses less digits than its factorization.

39683421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4409275 (or 4409272 counting only the distinct ones).

The product of its digits is 31104, while the sum is 36.

The square root of 39683421 is about 6299.4778355035. The cubic root of 39683421 is about 341.0905611100.

It can be divided in two parts, 39683 and 421, that added together give a palindrome (40104).

The spelling of 39683421 in words is "thirty-nine million, six hundred eighty-three thousand, four hundred twenty-one".