1999040 has 28 divisors (see below), whose sum is σ = 4760976. Its totient is φ = 799488.

The previous prime is 1999033. The next prime is 1999043. The reversal of 1999040 is 409991.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a plaindrome in base 11.

It is a junction number, because it is equal to n+sod(n) for n = 1998988 and 1999006.

It is not an unprimeable number, because it can be changed into a prime (1999043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2804 + ... + 3443.

2^1999040 is an apocalyptic number.

1999040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1999040 is an abundant number, since it is smaller than the sum of its proper divisors (2761936).

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

1999040 is an equidigital number, since it uses as much as digits as its factorization.

1999040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6264 (or 6254 counting only the distinct ones).

The product of its (nonzero) digits is 2916, while the sum is 32.

The square root of 1999040 is about 1413.8741103790. The cubic root of 1999040 is about 125.9719430264.

The spelling of 1999040 in words is "one million, nine hundred ninety-nine thousand, forty".