133493987 has 8 divisors (see below), whose sum is σ = 147681792. Its totient is φ = 119648200.

The previous prime is 133493953. The next prime is 133493993. The reversal of 133493987 is 789394331.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 133493987 - 2¹⁰ = 133492963 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (133493917) 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, 84683 + ... + 86244.

It is an arithmetic number, because the mean of its divisors is an integer number (18460224).

Almost surely, 2^133493987 is an apocalyptic number.

133493987 is a deficient number, since it is larger than the sum of its proper divisors (14187805).

133493987 is a wasteful number, since it uses less digits than its factorization.

133493987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171009.

The product of its digits is 489888, while the sum is 47.

The square root of 133493987 is about 11553.9597974028. The cubic root of 133493987 is about 511.0780566088.

The spelling of 133493987 in words is "one hundred thirty-three million, four hundred ninety-three thousand, nine hundred eighty-seven".