38700721 has 4 divisors (see below), whose sum is σ = 40977252. Its totient is φ = 36424192.

The previous prime is 38700707. The next prime is 38700733. The reversal of 38700721 is 12700783.

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: 12700783 = 997 ⋅12739.

It can be written as a sum of positive squares in 2 ways, for example, as 29550096 + 9150625 = 5436^2 + 3025^2 .

It is a cyclic number.

It is not a de Polignac number, because 38700721 - 2¹³ = 38692529 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 38700721.

It is not an unprimeable number, because it can be changed into a prime (38700521) 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, 1138240 + ... + 1138273.

It is an arithmetic number, because the mean of its divisors is an integer number (10244313).

Almost surely, 2^38700721 is an apocalyptic number.

It is an amenable number.

38700721 is a deficient number, since it is larger than the sum of its proper divisors (2276531).

38700721 is a wasteful number, since it uses less digits than its factorization.

38700721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2276530.

The product of its (nonzero) digits is 2352, while the sum is 28.

The square root of 38700721 is about 6220.9903552409. The cubic root of 38700721 is about 338.2514643060.

The spelling of 38700721 in words is "thirty-eight million, seven hundred thousand, seven hundred twenty-one".