1918185272 has 8 divisors (see below), whose sum is σ = 3596597400. Its totient is φ = 959092632.

The previous prime is 1918185271. The next prime is 1918185319. The reversal of 1918185272 is 2725818191.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1918185271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 119886572 + ... + 119886587.

It is an arithmetic number, because the mean of its divisors is an integer number (449574675).

Almost surely, 2^1918185272 is an apocalyptic number.

It is an amenable number.

1918185272 is a deficient number, since it is larger than the sum of its proper divisors (1678412128).

1918185272 is a wasteful number, since it uses less digits than its factorization.

1918185272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 239773165 (or 239773161 counting only the distinct ones).

The product of its digits is 80640, while the sum is 44.

The square root of 1918185272 is about 43797.0920495870. The cubic root of 1918185272 is about 1242.5012968745.

The spelling of 1918185272 in words is "one billion, nine hundred eighteen million, one hundred eighty-five thousand, two hundred seventy-two".