1911949 has 4 divisors (see below), whose sum is σ = 2059036. Its totient is φ = 1764864.

The previous prime is 1911937. The next prime is 1911961. The reversal of 1911949 is 9491191.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (1911937) and next prime (1911961).

It can be written as a sum of positive squares in 2 ways, for example, as 240100 + 1671849 = 490^2 + 1293^2 .

It is a cyclic number.

It is not a de Polignac number, because 1911949 - 2¹³ = 1903757 is a prime.

It is a Duffinian number.

It is a plaindrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1911919) 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 3 ways as a sum of consecutive naturals, for example, 73524 + ... + 73549.

It is an arithmetic number, because the mean of its divisors is an integer number (514759).

2^1911949 is an apocalyptic number.

It is an amenable number.

1911949 is a deficient number, since it is larger than the sum of its proper divisors (147087).

1911949 is a wasteful number, since it uses less digits than its factorization.

1911949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147086.

The product of its digits is 2916, while the sum is 34.

The square root of 1911949 is about 1382.7324397728. The cubic root of 1911949 is about 124.1153323424.

The spelling of 1911949 in words is "one million, nine hundred eleven thousand, nine hundred forty-nine".