1018644198 has 64 divisors (see below), whose sum is σ = 2476051200. Its totient is φ = 275103360.

The previous prime is 1018644167. The next prime is 1018644271. The reversal of 1018644198 is 8914468101.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4413 + ... + 45351.

It is an arithmetic number, because the mean of its divisors is an integer number (38688300).

Almost surely, 2^1018644198 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1018644198, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1238025600).

1018644198 is an abundant number, since it is smaller than the sum of its proper divisors (1457407002).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1018644198 is a wasteful number, since it uses less digits than its factorization.

1018644198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40997.

The product of its (nonzero) digits is 55296, while the sum is 42.

The square root of 1018644198 is about 31916.2058835320. The cubic root of 1018644198 is about 1006.1765049108.

The spelling of 1018644198 in words is "one billion, eighteen million, six hundred forty-four thousand, one hundred ninety-eight".