1912342489 has 4 divisors (see below), whose sum is σ = 1915877860. Its totient is φ = 1908807120.

The previous prime is 1912342423. The next prime is 1912342511. The reversal of 1912342489 is 9842432191.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9842432191 = 67 ⋅146901973.

It can be written as a sum of positive squares in 2 ways, for example, as 713798089 + 1198544400 = 26717^2 + 34620^2 .

It is a cyclic number.

It is not a de Polignac number, because 1912342489 - 2⁷ = 1912342361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1912345489) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1766874 + ... + 1767955.

It is an arithmetic number, because the mean of its divisors is an integer number (478969465).

Almost surely, 2^1912342489 is an apocalyptic number.

It is an amenable number.

1912342489 is a deficient number, since it is larger than the sum of its proper divisors (3535371).

1912342489 is an equidigital number, since it uses as much as digits as its factorization.

1912342489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3535370.

The product of its digits is 124416, while the sum is 43.

The square root of 1912342489 is about 43730.3383133495. The cubic root of 1912342489 is about 1241.2384628427.

The spelling of 1912342489 in words is "one billion, nine hundred twelve million, three hundred forty-two thousand, four hundred eighty-nine".