87381389 has 4 divisors (see below), whose sum is σ = 88229856. Its totient is φ = 86532924.

The previous prime is 87381353. The next prime is 87381401. The reversal of 87381389 is 98318378.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 87381389 - 2¹² = 87377293 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87384389) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 424079 + ... + 424284.

It is an arithmetic number, because the mean of its divisors is an integer number (22057464).

Almost surely, 2^87381389 is an apocalyptic number.

It is an amenable number.

87381389 is a deficient number, since it is larger than the sum of its proper divisors (848467).

87381389 is a wasteful number, since it uses less digits than its factorization.

87381389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 848466.

The product of its digits is 290304, while the sum is 47.

The square root of 87381389 is about 9347.8012922826. The cubic root of 87381389 is about 443.7513098156.

The spelling of 87381389 in words is "eighty-seven million, three hundred eighty-one thousand, three hundred eighty-nine".