133215730 has 16 divisors (see below), whose sum is σ = 239920344. Its totient is φ = 53256960.

The previous prime is 133215727. The next prime is 133215737. The reversal of 133215730 is 37512331.

It can be written as a sum of positive squares in 4 ways, for example, as 104796169 + 28419561 = 10237^2 + 5331^2 .

It is a junction number, because it is equal to n+sod(n) for n = 133215695 and 133215704.

It is not an unprimeable number, because it can be changed into a prime (133215737) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31120 + ... + 35140.

Almost surely, 2^133215730 is an apocalyptic number.

133215730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

133215730 is a deficient number, since it is larger than the sum of its proper divisors (106704614).

133215730 is a wasteful number, since it uses less digits than its factorization.

133215730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7341.

The product of its (nonzero) digits is 1890, while the sum is 25.

The square root of 133215730 is about 11541.9118866850. The cubic root of 133215730 is about 510.7227098410.

The spelling of 133215730 in words is "one hundred thirty-three million, two hundred fifteen thousand, seven hundred thirty".