1918722 has 32 divisors (see below), whose sum is σ = 4378752. Its totient is φ = 555264.

The previous prime is 1918687. The next prime is 1918733. The reversal of 1918722 is 2278191.

It is a super-2 number, since 2×1918722² = 7362988226568, which contains 22 as substring.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 1918722.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 603 + ... + 2049.

It is an arithmetic number, because the mean of its divisors is an integer number (136836).

2^1918722 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1918722, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2189376).

1918722 is an abundant number, since it is smaller than the sum of its proper divisors (2460030).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1918722 is a wasteful number, since it uses less digits than its factorization.

1918722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1482.

The product of its digits is 2016, while the sum is 30.

The square root of 1918722 is about 1385.1794107624. The cubic root of 1918722 is about 124.2617174288.

The spelling of 1918722 in words is "one million, nine hundred eighteen thousand, seven hundred twenty-two".