133311990 has 64 divisors (see below), whose sum is σ = 366736896. Its totient is φ = 30381312.

The previous prime is 133311989. The next prime is 133311991. The reversal of 133311990 is 99113331.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (133311989) and next prime (133311991).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133311991) 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, 92314 + ... + 93746.

It is an arithmetic number, because the mean of its divisors is an integer number (5730264).

Almost surely, 2^133311990 is an apocalyptic number.

133311990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 133311990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (183368448).

133311990 is an abundant number, since it is smaller than the sum of its proper divisors (233424906).

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

133311990 is a wasteful number, since it uses less digits than its factorization.

133311990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1893.

The product of its (nonzero) digits is 2187, while the sum is 30.

The square root of 133311990 is about 11546.0811533611. The cubic root of 133311990 is about 510.8456941450.

The spelling of 133311990 in words is "one hundred thirty-three million, three hundred eleven thousand, nine hundred ninety".