1491999 has 16 divisors (see below), whose sum is σ = 2095104. Its totient is φ = 943200.

The previous prime is 1491991. The next prime is 1492009. The reversal of 1491999 is 9991941.

It is not a de Polignac number, because 1491999 - 2³ = 1491991 is a prime.

It is a super-2 number, since 2×1491999² = 4452122032002, which contains 22 as substring.

1491999 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 1491999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1491991) 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, 5542 + ... + 5804.

It is an arithmetic number, because the mean of its divisors is an integer number (130944).

2^1491999 is an apocalyptic number.

1491999 is a deficient number, since it is larger than the sum of its proper divisors (603105).

1491999 is a wasteful number, since it uses less digits than its factorization.

1491999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 358.

The product of its digits is 26244, while the sum is 42.

The square root of 1491999 is about 1221.4741094268. The cubic root of 1491999 is about 114.2675311101.

The spelling of 1491999 in words is "one million, four hundred ninety-one thousand, nine hundred ninety-nine".