1918690 has 16 divisors (see below), whose sum is σ = 3470328. Its totient is φ = 763776.

The previous prime is 1918687. The next prime is 1918733. The reversal of 1918690 is 968191.

It can be written as a sum of positive squares in 4 ways, for example, as 277729 + 1640961 = 527^2 + 1281^2 .

It is a super-2 number, since 2×1918690² = 7362742632200, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2824 + ... + 3436.

2^1918690 is an apocalyptic number.

1918690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1918690 is a deficient number, since it is larger than the sum of its proper divisors (1551638).

1918690 is a wasteful number, since it uses less digits than its factorization.

1918690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 933.

The product of its (nonzero) digits is 3888, while the sum is 34.

The square root of 1918690 is about 1385.1678598639. The cubic root of 1918690 is about 124.2610266223.

The spelling of 1918690 in words is "one million, nine hundred eighteen thousand, six hundred ninety".