38200721 has 4 divisors (see below), whose sum is σ = 41139252. Its totient is φ = 35262192.

The previous prime is 38200709. The next prime is 38200733. The reversal of 38200721 is 12700283.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (38200709) and next prime (38200733).

It can be written as a sum of positive squares in 2 ways, for example, as 11316496 + 26884225 = 3364^2 + 5185^2 .

It is a cyclic number.

It is not a de Polignac number, because 38200721 - 2¹⁴ = 38184337 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (38202721) 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, 1469246 + ... + 1469271.

It is an arithmetic number, because the mean of its divisors is an integer number (10284813).

Almost surely, 2^38200721 is an apocalyptic number.

It is an amenable number.

38200721 is a deficient number, since it is larger than the sum of its proper divisors (2938531).

38200721 is a wasteful number, since it uses less digits than its factorization.

38200721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2938530.

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 38200721 is about 6180.6731834000. The cubic root of 38200721 is about 336.7884480299.

The spelling of 38200721 in words is "thirty-eight million, two hundred thousand, seven hundred twenty-one".