1915988 has 12 divisors (see below), whose sum is σ = 3362772. Its totient is φ = 955200.

The previous prime is 1915981. The next prime is 1915993. The reversal of 1915988 is 8895191.

It can be written as a sum of positive squares in 2 ways, for example, as 1295044 + 620944 = 1138^2 + 788^2 .

It is a super-2 number, since 2×1915988² = 7342020032288, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1915981) 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, 2006 + ... + 2802.

It is an arithmetic number, because the mean of its divisors is an integer number (280231).

2^1915988 is an apocalyptic number.

It is an amenable number.

1915988 is a deficient number, since it is larger than the sum of its proper divisors (1446784).

1915988 is a wasteful number, since it uses less digits than its factorization.

1915988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1402 (or 1400 counting only the distinct ones).

The product of its digits is 25920, while the sum is 41.

The square root of 1915988 is about 1384.1921831884. The cubic root of 1915988 is about 124.2026689189.

The spelling of 1915988 in words is "one million, nine hundred fifteen thousand, nine hundred eighty-eight".