33861381 has 4 divisors (see below), whose sum is σ = 45148512. Its totient is φ = 22574252.

The previous prime is 33861379. The next prime is 33861383. The reversal of 33861381 is 18316833.

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: 18316833 = 3 ⋅6105611.

It is an interprime number because it is at equal distance from previous prime (33861379) and next prime (33861383).

It is a cyclic number.

It is not a de Polignac number, because 33861381 - 2¹ = 33861379 is a prime.

It is a super-2 number, since 2×33861381² = 2293186246454322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33861383) 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, 5643561 + ... + 5643566.

It is an arithmetic number, because the mean of its divisors is an integer number (11287128).

Almost surely, 2^33861381 is an apocalyptic number.

It is an amenable number.

33861381 is a deficient number, since it is larger than the sum of its proper divisors (11287131).

33861381 is a wasteful number, since it uses less digits than its factorization.

33861381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11287130.

The product of its digits is 10368, while the sum is 33.

The square root of 33861381 is about 5819.0532735145. The cubic root of 33861381 is about 323.5203140226.

The spelling of 33861381 in words is "thirty-three million, eight hundred sixty-one thousand, three hundred eighty-one".