1918120390 has 8 divisors (see below), whose sum is σ = 3452616720. Its totient is φ = 767248152.

The previous prime is 1918120361. The next prime is 1918120427. The reversal of 1918120390 is 930218191.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 95906010 + ... + 95906029.

It is an arithmetic number, because the mean of its divisors is an integer number (431577090).

Almost surely, 2^1918120390 is an apocalyptic number.

1918120390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1918120390 is a deficient number, since it is larger than the sum of its proper divisors (1534496330).

1918120390 is a wasteful number, since it uses less digits than its factorization.

1918120390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191812046.

The product of its (nonzero) digits is 3888, while the sum is 34.

The square root of 1918120390 is about 43796.3513320459. The cubic root of 1918120390 is about 1242.4872876476.

The spelling of 1918120390 in words is "one billion, nine hundred eighteen million, one hundred twenty thousand, three hundred ninety".