38236721 has 8 divisors (see below), whose sum is σ = 40666080. Its totient is φ = 35849088.

The previous prime is 38236687. The next prime is 38236729. The reversal of 38236721 is 12763283.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 38236721 - 2⁶ = 38236657 is a prime.

It is not an unprimeable number, because it can be changed into a prime (38236729) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8531 + ... + 12216.

It is an arithmetic number, because the mean of its divisors is an integer number (5083260).

Almost surely, 2^38236721 is an apocalyptic number.

It is an amenable number.

38236721 is a deficient number, since it is larger than the sum of its proper divisors (2429359).

38236721 is a wasteful number, since it uses less digits than its factorization.

38236721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20863.

The product of its digits is 12096, while the sum is 32.

The square root of 38236721 is about 6183.5848017149. The cubic root of 38236721 is about 336.8942102352.

The spelling of 38236721 in words is "thirty-eight million, two hundred thirty-six thousand, seven hundred twenty-one".