1919949 has 4 divisors (see below), whose sum is σ = 2559936. Its totient is φ = 1279964.

The previous prime is 1919947. The next prime is 1919959. The reversal of 1919949 is 9499191.

1919949 is nontrivially palindromic in base 5.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1919949 - 2¹ = 1919947 is a prime.

It is a D-number.

It is a self number, because there is not a number n which added to its sum of digits gives 1919949.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1919947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 319989 + ... + 319994.

It is an arithmetic number, because the mean of its divisors is an integer number (639984).

2^1919949 is an apocalyptic number.

It is an amenable number.

1919949 is a deficient number, since it is larger than the sum of its proper divisors (639987).

1919949 is an equidigital number, since it uses as much as digits as its factorization.

1919949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 639986.

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

The square root of 1919949 is about 1385.6222428931. The cubic root of 1919949 is about 124.2881997502.

The spelling of 1919949 in words is "one million, nine hundred nineteen thousand, nine hundred forty-nine".