38721115 has 4 divisors (see below), whose sum is σ = 46465344. Its totient is φ = 30976888.

The previous prime is 38721103. The next prime is 38721131. The reversal of 38721115 is 51112783.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 51112783 = 1217 ⋅41999.

It is a cyclic number.

It is not a de Polignac number, because 38721115 - 2⁵ = 38721083 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3872107 + ... + 3872116.

It is an arithmetic number, because the mean of its divisors is an integer number (11616336).

Almost surely, 2^38721115 is an apocalyptic number.

38721115 is a deficient number, since it is larger than the sum of its proper divisors (7744229).

38721115 is an equidigital number, since it uses as much as digits as its factorization.

38721115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7744228.

The product of its digits is 1680, while the sum is 28.

The square root of 38721115 is about 6222.6292674399. The cubic root of 38721115 is about 338.3108696505.

Adding to 38721115 its reverse (51112783), we get a palindrome (89833898).

The spelling of 38721115 in words is "thirty-eight million, seven hundred twenty-one thousand, one hundred fifteen".