918881386 has 4 divisors (see below), whose sum is σ = 1378322082. Its totient is φ = 459440692.

The previous prime is 918881377. The next prime is 918881413. The reversal of 918881386 is 683188819.

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

It can be written as a sum of positive squares in only one way, i.e., 874325761 + 44555625 = 29569^2 + 6675^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 229720345 + ... + 229720348.

Almost surely, 2^918881386 is an apocalyptic number.

918881386 is a deficient number, since it is larger than the sum of its proper divisors (459440696).

918881386 is a wasteful number, since it uses less digits than its factorization.

918881386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 459440695.

The product of its digits is 663552, while the sum is 52.

The square root of 918881386 is about 30313.0563619045. The cubic root of 918881386 is about 972.1944810317.

The spelling of 918881386 in words is "nine hundred eighteen million, eight hundred eighty-one thousand, three hundred eighty-six".