38891261 has 4 divisors (see below), whose sum is σ = 39424092. Its totient is φ = 38358432.

The previous prime is 38891239. The next prime is 38891269. The reversal of 38891261 is 16219883.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 17556100 + 21335161 = 4190^2 + 4619^2 .

It is a cyclic number.

It is not a de Polignac number, because 38891261 - 2⁶ = 38891197 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38891269) 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, 266306 + ... + 266451.

It is an arithmetic number, because the mean of its divisors is an integer number (9856023).

Almost surely, 2^38891261 is an apocalyptic number.

It is an amenable number.

38891261 is a deficient number, since it is larger than the sum of its proper divisors (532831).

38891261 is an equidigital number, since it uses as much as digits as its factorization.

38891261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 532830.

The product of its digits is 20736, while the sum is 38.

The square root of 38891261 is about 6236.2858337315. The cubic root of 38891261 is about 338.8056740509.

The spelling of 38891261 in words is "thirty-eight million, eight hundred ninety-one thousand, two hundred sixty-one".