1911998 has 16 divisors (see below), whose sum is σ = 3150576. Its totient is φ = 863040.

The previous prime is 1911991. The next prime is 1912019. The reversal of 1911998 is 8991191.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1911991) 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 7 ways as a sum of consecutive naturals, for example, 4940 + ... + 5312.

It is an arithmetic number, because the mean of its divisors is an integer number (196911).

2^1911998 is an apocalyptic number.

1911998 is a deficient number, since it is larger than the sum of its proper divisors (1238578).

1911998 is a wasteful number, since it uses less digits than its factorization.

1911998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 619.

The product of its digits is 5832, while the sum is 38.

The square root of 1911998 is about 1382.7501581992. The cubic root of 1911998 is about 124.1163926216.

The spelling of 1911998 in words is "one million, nine hundred eleven thousand, nine hundred ninety-eight".