1918369861 has 8 divisors (see below), whose sum is σ = 1938267648. Its totient is φ = 1898490000.

The previous prime is 1918369853. The next prime is 1918369883. The reversal of 1918369861 is 1689638191.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1918369861 - 2³ = 1918369853 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1918369799 and 1918369808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1918369891) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 364116 + ... + 369346.

It is an arithmetic number, because the mean of its divisors is an integer number (242283456).

Almost surely, 2^1918369861 is an apocalyptic number.

It is an amenable number.

1918369861 is a deficient number, since it is larger than the sum of its proper divisors (19897787).

1918369861 is a wasteful number, since it uses less digits than its factorization.

1918369861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8963.

The product of its digits is 559872, while the sum is 52.

The square root of 1918369861 is about 43799.1993191656. The cubic root of 1918369861 is about 1242.5411513346.

The spelling of 1918369861 in words is "one billion, nine hundred eighteen million, three hundred sixty-nine thousand, eight hundred sixty-one".