1918540312 has 16 divisors (see below), whose sum is σ = 3873975840. Its totient is φ = 885480096.

The previous prime is 1918540303. The next prime is 1918540313. The reversal of 1918540312 is 2130458191.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1918540313) 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, 9223648 + ... + 9223855.

It is an arithmetic number, because the mean of its divisors is an integer number (242123490).

Almost surely, 2^1918540312 is an apocalyptic number.

It is an amenable number.

1918540312 is an abundant number, since it is smaller than the sum of its proper divisors (1955435528).

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

1918540312 is a wasteful number, since it uses less digits than its factorization.

1918540312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18447522 (or 18447518 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 34.

The square root of 1918540312 is about 43801.1450991866. The cubic root of 1918540312 is about 1242.5779510004.

The spelling of 1918540312 in words is "one billion, nine hundred eighteen million, five hundred forty thousand, three hundred twelve".