1986428 has 12 divisors (see below), whose sum is σ = 3557400. Its totient is φ = 970032.

The previous prime is 1986421. The next prime is 1986437. The reversal of 1986428 is 8246891.

It is a junction number, because it is equal to n+sod(n) for n = 1986391 and 1986400.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 5603 + ... + 5946.

It is an arithmetic number, because the mean of its divisors is an integer number (296450).

2^1986428 is an apocalyptic number.

It is an amenable number.

1986428 is a deficient number, since it is larger than the sum of its proper divisors (1570972).

1986428 is a wasteful number, since it uses less digits than its factorization.

1986428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11596 (or 11594 counting only the distinct ones).

The product of its digits is 27648, while the sum is 38.

The square root of 1986428 is about 1409.4069674867. The cubic root of 1986428 is about 125.7064637498.

The spelling of 1986428 in words is "one million, nine hundred eighty-six thousand, four hundred twenty-eight".