1988726 has 4 divisors (see below), whose sum is σ = 2983092. Its totient is φ = 994362.

The previous prime is 1988699. The next prime is 1988729. The reversal of 1988726 is 6278891.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6278891 = 487 ⋅12893.

It is a super-2 number, since 2×1988726² = 7910062206152, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1988729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 497180 + ... + 497183.

It is an arithmetic number, because the mean of its divisors is an integer number (745773).

2^1988726 is an apocalyptic number.

1988726 is a deficient number, since it is larger than the sum of its proper divisors (994366).

1988726 is an equidigital number, since it uses as much as digits as its factorization.

1988726 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 994365.

The product of its digits is 48384, while the sum is 41.

The square root of 1988726 is about 1410.2219683440. The cubic root of 1988726 is about 125.7549195930.

The spelling of 1988726 in words is "one million, nine hundred eighty-eight thousand, seven hundred twenty-six".