33157987 has 4 divisors (see below), whose sum is σ = 33612280. Its totient is φ = 32703696.

The previous prime is 33157967. The next prime is 33158009. The reversal of 33157987 is 78975133.

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

It is a cyclic number.

It is not a de Polignac number, because 33157987 - 2¹⁵ = 33125219 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (33157937) 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, 227037 + ... + 227182.

It is an arithmetic number, because the mean of its divisors is an integer number (8403070).

Almost surely, 2^33157987 is an apocalyptic number.

33157987 is a deficient number, since it is larger than the sum of its proper divisors (454293).

33157987 is an equidigital number, since it uses as much as digits as its factorization.

33157987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 454292.

The product of its digits is 158760, while the sum is 43.

The square root of 33157987 is about 5758.2972309529. The cubic root of 33157987 is about 321.2644857130.

The spelling of 33157987 in words is "thirty-three million, one hundred fifty-seven thousand, nine hundred eighty-seven".