1986408 has 48 divisors (see below), whose sum is σ = 5503680. Its totient is φ = 646944.

The previous prime is 1986401. The next prime is 1986421. The reversal of 1986408 is 8046891.

It is a happy number.

1986408 is a `hidden beast` number, since 1 + 9 + 8 + 640 + 8 = 666.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (1986401) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3091 + ... + 3677.

It is an arithmetic number, because the mean of its divisors is an integer number (114660).

2^1986408 is an apocalyptic number.

1986408 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1986408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2751840).

1986408 is an abundant number, since it is smaller than the sum of its proper divisors (3517272).

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

1986408 is a wasteful number, since it uses less digits than its factorization.

1986408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 646 (or 639 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The square root of 1986408 is about 1409.3998722861. The cubic root of 1986408 is about 125.7060418640.

The spelling of 1986408 in words is "one million, nine hundred eighty-six thousand, four hundred eight".