33402138 has 64 divisors (see below), whose sum is σ = 83939328. Its totient is φ = 8608320.

The previous prime is 33402121. The next prime is 33402139. The reversal of 33402138 is 83120433.

It is a super-2 number, since 2×33402138² = 2231405645942088, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (33402139) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 90831 + ... + 91197.

It is an arithmetic number, because the mean of its divisors is an integer number (1311552).

Almost surely, 2^33402138 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 33402138, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41969664).

33402138 is an abundant number, since it is smaller than the sum of its proper divisors (50537190).

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

33402138 is a wasteful number, since it uses less digits than its factorization.

33402138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 587.

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 33402138 is about 5779.4582791123. The cubic root of 33402138 is about 322.0510766037.

The spelling of 33402138 in words is "thirty-three million, four hundred two thousand, one hundred thirty-eight".