133402987 has 4 divisors (see below), whose sum is σ = 138003120. Its totient is φ = 128802856.

The previous prime is 133402981. The next prime is 133402991. The reversal of 133402987 is 789204331.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 789204331 = 139 ⋅5677729.

It is a cyclic number.

It is not a de Polignac number, because 133402987 - 2³ = 133402979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (133402981) 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 3 ways as a sum of consecutive naturals, for example, 2300023 + ... + 2300080.

It is an arithmetic number, because the mean of its divisors is an integer number (34500780).

Almost surely, 2^133402987 is an apocalyptic number.

133402987 is a deficient number, since it is larger than the sum of its proper divisors (4600133).

133402987 is an equidigital number, since it uses as much as digits as its factorization.

133402987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4600132.

The product of its (nonzero) digits is 36288, while the sum is 37.

The square root of 133402987 is about 11550.0210822318. The cubic root of 133402987 is about 510.9618998788.

The spelling of 133402987 in words is "one hundred thirty-three million, four hundred two thousand, nine hundred eighty-seven".