1999662 has 32 divisors (see below), whose sum is σ = 4672512. Its totient is φ = 558624.

The previous prime is 1999661. The next prime is 1999667. The reversal of 1999662 is 2669991.

It is a happy number.

It is a super-2 number, since 2×1999662² = 7997296228488, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1999661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1468 + ... + 2480.

It is an arithmetic number, because the mean of its divisors is an integer number (146016).

2^1999662 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1999662, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2336256).

1999662 is an abundant number, since it is smaller than the sum of its proper divisors (2672850).

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

1999662 is a wasteful number, since it uses less digits than its factorization.

1999662 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1072.

The product of its digits is 52488, while the sum is 42.

The square root of 1999662 is about 1414.0940562777. The cubic root of 1999662 is about 125.9850070344.

It can be divided in two parts, 19 and 99662, that added together give a triangular number (99681 = T₄₄₆).

The spelling of 1999662 in words is "one million, nine hundred ninety-nine thousand, six hundred sixty-two".