33406987 has 4 divisors (see below), whose sum is σ = 33425496. Its totient is φ = 33388480.

The previous prime is 33406979. The next prime is 33407009. The reversal of 33406987 is 78960433.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78960433 = 2053 ⋅38461.

It is a cyclic number.

It is not a de Polignac number, because 33406987 - 2³ = 33406979 is a prime.

It is a super-2 number, since 2×33406987² = 2232053560836338, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (33406957) 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, 6214 + ... + 10267.

It is an arithmetic number, because the mean of its divisors is an integer number (8356374).

Almost surely, 2^33406987 is an apocalyptic number.

33406987 is a deficient number, since it is larger than the sum of its proper divisors (18509).

33406987 is a wasteful number, since it uses less digits than its factorization.

33406987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18508.

The product of its (nonzero) digits is 108864, while the sum is 40.

The square root of 33406987 is about 5779.8777668736. The cubic root of 33406987 is about 322.0666599387.

The spelling of 33406987 in words is "thirty-three million, four hundred six thousand, nine hundred eighty-seven".