38662721 has 4 divisors (see below), whose sum is σ = 38698452. Its totient is φ = 38626992.

The previous prime is 38662703. The next prime is 38662727. The reversal of 38662721 is 12726683.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12726683 = 2713 ⋅4691.

It can be written as a sum of positive squares in 2 ways, for example, as 6864400 + 31798321 = 2620^2 + 5639^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-38662721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (38662727) 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, 16190 + ... + 18423.

It is an arithmetic number, because the mean of its divisors is an integer number (9674613).

Almost surely, 2^38662721 is an apocalyptic number.

It is an amenable number.

38662721 is a deficient number, since it is larger than the sum of its proper divisors (35731).

38662721 is a wasteful number, since it uses less digits than its factorization.

38662721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35730.

The product of its digits is 24192, while the sum is 35.

The square root of 38662721 is about 6217.9354290633. The cubic root of 38662721 is about 338.1407190404.

The spelling of 38662721 in words is "thirty-eight million, six hundred sixty-two thousand, seven hundred twenty-one".