38471721 has 4 divisors (see below), whose sum is σ = 51295632. Its totient is φ = 25647812.

The previous prime is 38471707. The next prime is 38471723. The reversal of 38471721 is 12717483.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12717483 = 3 ⋅4239161.

It is a cyclic number.

It is not a de Polignac number, because 38471721 - 2⁵ = 38471689 is a prime.

It is not an unprimeable number, because it can be changed into a prime (38471723) 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, 6411951 + ... + 6411956.

It is an arithmetic number, because the mean of its divisors is an integer number (12823908).

Almost surely, 2^38471721 is an apocalyptic number.

It is an amenable number.

38471721 is a deficient number, since it is larger than the sum of its proper divisors (12823911).

38471721 is a wasteful number, since it uses less digits than its factorization.

38471721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12823910.

The product of its digits is 9408, while the sum is 33.

The square root of 38471721 is about 6202.5576176284. The cubic root of 38471721 is about 337.5829765802.

The spelling of 38471721 in words is "thirty-eight million, four hundred seventy-one thousand, seven hundred twenty-one".