1918197236 has 6 divisors (see below), whose sum is σ = 3356845170. Its totient is φ = 959098616.

The previous prime is 1918197233. The next prime is 1918197241. The reversal of 1918197236 is 6327918191.

It can be written as a sum of positive squares in only one way, i.e., 1270494736 + 647702500 = 35644^2 + 25450^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1918197233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 239774651 + ... + 239774658.

It is an arithmetic number, because the mean of its divisors is an integer number (559474195).

Almost surely, 2^1918197236 is an apocalyptic number.

It is an amenable number.

1918197236 is a deficient number, since it is larger than the sum of its proper divisors (1438647934).

1918197236 is a wasteful number, since it uses less digits than its factorization.

1918197236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 479549313 (or 479549311 counting only the distinct ones).

The product of its digits is 163296, while the sum is 47.

The square root of 1918197236 is about 43797.2286337846. The cubic root of 1918197236 is about 1242.5038800894.

The spelling of 1918197236 in words is "one billion, nine hundred eighteen million, one hundred ninety-seven thousand, two hundred thirty-six".