18987334 has 16 divisors (see below), whose sum is σ = 30542400. Its totient is φ = 8820864.

The previous prime is 18987323. The next prime is 18987337. The reversal of 18987334 is 43378981.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18987337) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 849 + ... + 6220.

It is an arithmetic number, because the mean of its divisors is an integer number (1908900).

Almost surely, 2^18987334 is an apocalyptic number.

18987334 is a deficient number, since it is larger than the sum of its proper divisors (11555066).

18987334 is a wasteful number, since it uses less digits than its factorization.

18987334 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7167.

The product of its digits is 145152, while the sum is 43.

The square root of 18987334 is about 4357.4458114818. The cubic root of 18987334 is about 266.7808569979.

It can be divided in two parts, 18987 and 334, that added together give a square (19321 = 139²).

The spelling of 18987334 in words is "eighteen million, nine hundred eighty-seven thousand, three hundred thirty-four".