1917243140 has 12 divisors (see below), whose sum is σ = 4026210636.
Its totient is φ = 766897248.
The previous prime is 1917243109. The next prime is 1917243149. The reversal of 1917243140 is 413427191.
It can be written as a sum of positive squares in 2 ways, for example, as 1502957824 + 414285316 = 38768^2 + 20354^2
It is a junction number, because it is equal to n+sod(n) for n = 1917243097 and 1917243106.
It is not an unprimeable number, because it can be changed into a prime (1917243149) 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, 47931059 + ... + 47931098.
It is an arithmetic number, because the mean of its divisors is an integer number (335517553).
Almost surely, 21917243140 is an apocalyptic number.
1917243140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.
It is an amenable number.
1917243140 is an abundant number, since it is smaller than the sum of its proper divisors (2108967496).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
1917243140 is a wasteful number, since it uses less digits than its factorization.
1917243140 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 95862166 (or 95862164 counting only the distinct ones).
The product of its (nonzero) digits is 6048, while the sum is 32.
The square root of 1917243140 is about 43786.3350829914.
The cubic root of 1917243140 is about 1242.2978420864.
The spelling of 1917243140 in words is "one billion, nine hundred seventeen million, two hundred forty-three thousand, one hundred forty".