133261986 has 32 divisors (see below), whose sum is σ = 313121088. Its totient is φ = 37275840.

The previous prime is 133261979. The next prime is 133261987. The reversal of 133261986 is 689162331.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (133261987) 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, 76801 + ... + 78516.

It is an arithmetic number, because the mean of its divisors is an integer number (9785034).

Almost surely, 2^133261986 is an apocalyptic number.

133261986 is an abundant number, since it is smaller than the sum of its proper divisors (179859102).

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

133261986 is a wasteful number, since it uses less digits than its factorization.

133261986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155346.

The product of its digits is 46656, while the sum is 39.

The square root of 133261986 is about 11543.9155402316. The cubic root of 133261986 is about 510.7818151131.

The spelling of 133261986 in words is "one hundred thirty-three million, two hundred sixty-one thousand, nine hundred eighty-six".