1918081 has 8 divisors (see below), whose sum is σ = 2110464. Its totient is φ = 1728720.

The previous prime is 1918079. The next prime is 1918087. The reversal of 1918081 is 1808191.

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 1918081 - 2¹ = 1918079 is a prime.

It is a super-2 number, since 2×1918081² = 7358069445122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1918087) 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, 711 + ... + 2083.

It is an arithmetic number, because the mean of its divisors is an integer number (263808).

2^1918081 is an apocalyptic number.

1918081 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1918081 is a deficient number, since it is larger than the sum of its proper divisors (192383).

1918081 is a wasteful number, since it uses less digits than its factorization.

1918081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1511.

The product of its (nonzero) digits is 576, while the sum is 28.

The square root of 1918081 is about 1384.9480134648. The cubic root of 1918081 is about 124.2478782462.

The spelling of 1918081 in words is "one million, nine hundred eighteen thousand, eighty-one".