33013889 has 4 divisors (see below), whose sum is σ = 33042756. Its totient is φ = 32985024.

The previous prime is 33013829. The next prime is 33013891. The reversal of 33013889 is 98831033.

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 6150400 + 26863489 = 2480^2 + 5183^2 .

It is a cyclic number.

It is not a de Polignac number, because 33013889 - 2¹² = 33009793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (33013829) 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, 12644 + ... + 15029.

It is an arithmetic number, because the mean of its divisors is an integer number (8260689).

Almost surely, 2^33013889 is an apocalyptic number.

It is an amenable number.

33013889 is a deficient number, since it is larger than the sum of its proper divisors (28867).

33013889 is a wasteful number, since it uses less digits than its factorization.

33013889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28866.

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 33013889 is about 5745.7714016483. The cubic root of 33013889 is about 320.7984261267.

The spelling of 33013889 in words is "thirty-three million, thirteen thousand, eight hundred eighty-nine".