33978423 has 4 divisors (see below), whose sum is σ = 45304568. Its totient is φ = 22652280.

The previous prime is 33978419. The next prime is 33978433. The reversal of 33978423 is 32487933.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32487933 = 3 ⋅10829311.

It is not a de Polignac number, because 33978423 - 2² = 33978419 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 (33978433) 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, 5663068 + ... + 5663073.

It is an arithmetic number, because the mean of its divisors is an integer number (11326142).

Almost surely, 2^33978423 is an apocalyptic number.

33978423 is a deficient number, since it is larger than the sum of its proper divisors (11326145).

33978423 is a wasteful number, since it uses less digits than its factorization.

33978423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11326144.

The product of its digits is 108864, while the sum is 39.

The square root of 33978423 is about 5829.1013887219. The cubic root of 33978423 is about 323.8926351318.

The spelling of 33978423 in words is "thirty-three million, nine hundred seventy-eight thousand, four hundred twenty-three".