133398240 has 96 divisors (see below), whose sum is σ = 442350720. Its totient is φ = 33698304.

The previous prime is 133398203. The next prime is 133398247. The reversal of 133398240 is 42893331.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (96).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133398247) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1807 + ... + 16433.

It is an arithmetic number, because the mean of its divisors is an integer number (4607820).

Almost surely, 2^133398240 is an apocalyptic number.

133398240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 133398240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (221175360).

133398240 is an abundant number, since it is smaller than the sum of its proper divisors (308952480).

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

133398240 is a wasteful number, since it uses less digits than its factorization.

133398240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14664 (or 14656 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 33.

The square root of 133398240 is about 11549.8155829433. The cubic root of 133398240 is about 510.9558391326.

The spelling of 133398240 in words is "one hundred thirty-three million, three hundred ninety-eight thousand, two hundred forty".