133898749 has 4 divisors (see below), whose sum is σ = 141775164. Its totient is φ = 126022336.

The previous prime is 133898747. The next prime is 133898777. The reversal of 133898749 is 947898331.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 68773849 + 65124900 = 8293^2 + 8070^2 .

It is a cyclic number.

It is not a de Polignac number, because 133898749 - 2¹ = 133898747 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 133898696 and 133898705.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133898747) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3938182 + ... + 3938215.

It is an arithmetic number, because the mean of its divisors is an integer number (35443791).

Almost surely, 2^133898749 is an apocalyptic number.

It is an amenable number.

133898749 is a deficient number, since it is larger than the sum of its proper divisors (7876415).

133898749 is an equidigital number, since it uses as much as digits as its factorization.

133898749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7876414.

The product of its digits is 1306368, while the sum is 52.

The square root of 133898749 is about 11571.4626992442. The cubic root of 133898749 is about 511.5940754864.

The spelling of 133898749 in words is "one hundred thirty-three million, eight hundred ninety-eight thousand, seven hundred forty-nine".