133721712 has 40 divisors (see below), whose sum is σ = 383832080. Its totient is φ = 44573760.

The previous prime is 133721681. The next prime is 133721713. The reversal of 133721712 is 217127331.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133721713) 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, 154339 + ... + 155202.

It is an arithmetic number, because the mean of its divisors is an integer number (9595802).

Almost surely, 2^133721712 is an apocalyptic number.

133721712 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

133721712 is an abundant number, since it is smaller than the sum of its proper divisors (250110368).

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

133721712 is a wasteful number, since it uses less digits than its factorization.

133721712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309558 (or 309546 counting only the distinct ones).

The product of its digits is 1764, while the sum is 27.

The square root of 133721712 is about 11563.8104446588. The cubic root of 133721712 is about 511.3685044805.

The spelling of 133721712 in words is "one hundred thirty-three million, seven hundred twenty-one thousand, seven hundred twelve".