33401381 has 8 divisors (see below), whose sum is σ = 36255744. Its totient is φ = 30587760.

The previous prime is 33401363. The next prime is 33401393. The reversal of 33401381 is 18310433.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 33401381 - 2⁶ = 33401317 is a prime.

It is a super-2 number, since 2×33401381² = 2231304505414322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33401581) 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, 8465 + ... + 11766.

It is an arithmetic number, because the mean of its divisors is an integer number (4531968).

Almost surely, 2^33401381 is an apocalyptic number.

It is an amenable number.

33401381 is a deficient number, since it is larger than the sum of its proper divisors (2854363).

33401381 is a wasteful number, since it uses less digits than its factorization.

33401381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20371.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 33401381 is about 5779.3927881742. The cubic root of 33401381 is about 322.0486436806.

The spelling of 33401381 in words is "thirty-three million, four hundred one thousand, three hundred eighty-one".