33139830 has 16 divisors (see below), whose sum is σ = 79535664. Its totient is φ = 8837280.

The previous prime is 33139811. The next prime is 33139831. The reversal of 33139830 is 3893133.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 1104661 = 33139830 / (3 + 3 + 1 + 3 + 9 + 8 + 3 + 0).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33139831) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 552301 + ... + 552360.

It is an arithmetic number, because the mean of its divisors is an integer number (4970979).

Almost surely, 2^33139830 is an apocalyptic number.

33139830 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

33139830 is an abundant number, since it is smaller than the sum of its proper divisors (46395834).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

33139830 is a wasteful number, since it uses less digits than its factorization.

33139830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1104671.

The product of its (nonzero) digits is 5832, while the sum is 30.

The square root of 33139830 is about 5756.7204205172. The cubic root of 33139830 is about 321.2058345417.

The spelling of 33139830 in words is "thirty-three million, one hundred thirty-nine thousand, eight hundred thirty".