33138977 has 4 divisors (see below), whose sum is σ = 33184560. Its totient is φ = 33093396.

The previous prime is 33138971. The next prime is 33138991. The reversal of 33138977 is 77983133.

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: 77983133 = 23 ⋅3390571.

It is a cyclic number.

It is not a de Polignac number, because 33138977 - 2⁴ = 33138961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (33138971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21683 + ... + 23160.

It is an arithmetic number, because the mean of its divisors is an integer number (8296140).

Almost surely, 2^33138977 is an apocalyptic number.

It is an amenable number.

33138977 is a deficient number, since it is larger than the sum of its proper divisors (45583).

33138977 is an equidigital number, since it uses as much as digits as its factorization.

33138977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45582.

The product of its digits is 95256, while the sum is 41.

The square root of 33138977 is about 5756.6463327184. The cubic root of 33138977 is about 321.2030786341.

The spelling of 33138977 in words is "thirty-three million, one hundred thirty-eight thousand, nine hundred seventy-seven".