1912889 has 6 divisors (see below), whose sum is σ = 2102730. Its totient is φ = 1738880.

The previous prime is 1912879. The next prime is 1912903. The reversal of 1912889 is 9882191.

1912889 = 412² + 413² + ... + 422².

It can be written as a sum of positive squares in only one way, i.e., 1138489 + 774400 = 1067^2 + 880^2 .

It is not a de Polignac number, because 1912889 - 2⁴ = 1912873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1912829) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7784 + ... + 8025.

It is an arithmetic number, because the mean of its divisors is an integer number (350455).

2^1912889 is an apocalyptic number.

It is an amenable number.

1912889 is a deficient number, since it is larger than the sum of its proper divisors (189841).

1912889 is a wasteful number, since it uses less digits than its factorization.

1912889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15831 (or 15820 counting only the distinct ones).

The product of its digits is 10368, while the sum is 38.

The square root of 1912889 is about 1383.0723046898. The cubic root of 1912889 is about 124.1356692338.

The spelling of 1912889 in words is "one million, nine hundred twelve thousand, eight hundred eighty-nine".