1986426 has 36 divisors (see below), whose sum is σ = 4667598. Its totient is φ = 610272.

The previous prime is 1986421. The next prime is 1986437. The reversal of 1986426 is 6246891.

1986426 = T₂₅₀ + T₂₅₁ + ... + T₃₀₁.

1986426 is a `hidden beast` number, since 1 + 9 + 8 + 642 + 6 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 720801 + 1265625 = 849^2 + 1125^2 .

It is not an unprimeable number, because it can be changed into a prime (1986421) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 2716 + ... + 3368.

2^1986426 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1986426, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2333799).

1986426 is an abundant number, since it is smaller than the sum of its proper divisors (2681172).

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

1986426 is a wasteful number, since it uses less digits than its factorization.

1986426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 687 (or 671 counting only the distinct ones).

The product of its digits is 20736, while the sum is 36.

The square root of 1986426 is about 1409.4062579682. The cubic root of 1986426 is about 125.7064215614.

The spelling of 1986426 in words is "one million, nine hundred eighty-six thousand, four hundred twenty-six".