1986690 has 32 divisors (see below), whose sum is σ = 4872960. Its totient is φ = 518144.

The previous prime is 1986689. The next prime is 1986713. The reversal of 1986690 is 966891.

It is a super-2 number, since 2×1986690² = 7893874312200, which contains 22 as substring.

It is a Curzon number.

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, 706 + ... + 2114.

It is an arithmetic number, because the mean of its divisors is an integer number (152280).

2^1986690 is an apocalyptic number.

1986690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a pronic number, being equal to 1409×1410.

It is a practical number, because each smaller number is the sum of distinct divisors of 1986690, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2436480).

1986690 is an abundant number, since it is smaller than the sum of its proper divisors (2886270).

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

1986690 is a wasteful number, since it uses less digits than its factorization.

1986690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1466.

The product of its (nonzero) digits is 23328, while the sum is 39.

The square root of 1986690 is about 1409.4999113161. The cubic root of 1986690 is about 125.7119901932.

It can be divided in two parts, 1986 and 690, that multiplied together give a triangular number (1370340 = T₁₆₅₅).

The spelling of 1986690 in words is "one million, nine hundred eighty-six thousand, six hundred ninety".