1999147 has 8 divisors (see below), whose sum is σ = 2084832. Its totient is φ = 1915200.

The previous prime is 1999121. The next prime is 1999163. The reversal of 1999147 is 7419991.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1999147 - 2¹⁹ = 1474859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1999177) 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, 2247 + ... + 3007.

It is an arithmetic number, because the mean of its divisors is an integer number (260604).

2^1999147 is an apocalyptic number.

1999147 is a deficient number, since it is larger than the sum of its proper divisors (85685).

1999147 is an equidigital number, since it uses as much as digits as its factorization.

1999147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 869.

The product of its digits is 20412, while the sum is 40.

The square root of 1999147 is about 1413.9119491680. The cubic root of 1999147 is about 125.9741905648.

The spelling of 1999147 in words is "one million, nine hundred ninety-nine thousand, one hundred forty-seven".