1917243138 has 16 divisors (see below), whose sum is σ = 3835592640. Its totient is φ = 638896656.

The previous prime is 1917243109. The next prime is 1917243149. The reversal of 1917243138 is 8313427191.

It is a junction number, because it is equal to n+sod(n) for n = 1917243096 and 1917243105.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22653 + ... + 65936.

It is an arithmetic number, because the mean of its divisors is an integer number (239724540).

Almost surely, 2^1917243138 is an apocalyptic number.

1917243138 is an abundant number, since it is smaller than the sum of its proper divisors (1918349502).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1917243138 is a wasteful number, since it uses less digits than its factorization.

1917243138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92201.

The product of its digits is 36288, while the sum is 39.

The square root of 1917243138 is about 43786.3350601532. The cubic root of 1917243138 is about 1242.2978416544.

The spelling of 1917243138 in words is "one billion, nine hundred seventeen million, two hundred forty-three thousand, one hundred thirty-eight".