38729421 has 20 divisors (see below), whose sum is σ = 58261500. Its totient is φ = 25638336.

The previous prime is 38729407. The next prime is 38729441. The reversal of 38729421 is 12492783.

It can be written as a sum of positive squares in 2 ways, for example, as 12320100 + 26409321 = 3510^2 + 5139^2 .

It is not a de Polignac number, because 38729421 - 2⁵ = 38729389 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38729441) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 10465 + ... + 13673.

It is an arithmetic number, because the mean of its divisors is an integer number (2913075).

Almost surely, 2^38729421 is an apocalyptic number.

It is an amenable number.

38729421 is a deficient number, since it is larger than the sum of its proper divisors (19532079).

38729421 is a wasteful number, since it uses less digits than its factorization.

38729421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3370 (or 3361 counting only the distinct ones).

The product of its digits is 24192, while the sum is 36.

The square root of 38729421 is about 6223.2966344213. The cubic root of 38729421 is about 338.3350580826.

The spelling of 38729421 in words is "thirty-eight million, seven hundred twenty-nine thousand, four hundred twenty-one".