133397220 has 96 divisors (see below), whose sum is σ = 409328640. Its totient is φ = 32191360.

The previous prime is 133397219. The next prime is 133397227. The reversal of 133397220 is 22793331.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (133397227) 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, 236659 + ... + 237221.

It is an arithmetic number, because the mean of its divisors is an integer number (4263840).

Almost surely, 2^133397220 is an apocalyptic number.

133397220 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 133397220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (204664320).

133397220 is an abundant number, since it is smaller than the sum of its proper divisors (275931420).

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

133397220 is a wasteful number, since it uses less digits than its factorization.

133397220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 945 (or 943 counting only the distinct ones).

The product of its (nonzero) digits is 6804, while the sum is 30.

The square root of 133397220 is about 11549.7714263097. The cubic root of 133397220 is about 510.9545368259.

The spelling of 133397220 in words is "one hundred thirty-three million, three hundred ninety-seven thousand, two hundred twenty".