1999749 has 8 divisors (see below), whose sum is σ = 2706400. Its totient is φ = 1313136.

The previous prime is 1999733. The next prime is 1999771. The reversal of 1999749 is 9479991.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1999749 - 2⁴ = 1999733 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1999698 and 1999707.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1999799) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4774 + ... + 5175.

It is an arithmetic number, because the mean of its divisors is an integer number (338300).

2^1999749 is an apocalyptic number.

It is an amenable number.

1999749 is a deficient number, since it is larger than the sum of its proper divisors (706651).

1999749 is an equidigital number, since it uses as much as digits as its factorization.

1999749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10019.

The product of its digits is 183708, while the sum is 48.

The square root of 1999749 is about 1414.1248176876. The cubic root of 1999749 is about 125.9868340993.

The spelling of 1999749 in words is "one million, nine hundred ninety-nine thousand, seven hundred forty-nine".