38706421 has 4 divisors (see below), whose sum is σ = 41683852. Its totient is φ = 35728992.

The previous prime is 38706373. The next prime is 38706443. The reversal of 38706421 is 12460783.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12460783 = 199 ⋅62617.

It can be written as a sum of positive squares in 2 ways, for example, as 22905796 + 15800625 = 4786^2 + 3975^2 .

It is not a de Polignac number, because 38706421 - 2¹¹ = 38704373 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 (38706461) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1488696 + ... + 1488721.

It is an arithmetic number, because the mean of its divisors is an integer number (10420963).

Almost surely, 2^38706421 is an apocalyptic number.

It is an amenable number.

38706421 is a deficient number, since it is larger than the sum of its proper divisors (2977431).

38706421 is a wasteful number, since it uses less digits than its factorization.

38706421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2977430.

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 38706421 is about 6221.4484647870. The cubic root of 38706421 is about 338.2680698424.

The spelling of 38706421 in words is "thirty-eight million, seven hundred six thousand, four hundred twenty-one".