1918843990 has 32 divisors (see below), whose sum is σ = 3949026624. Its totient is φ = 657607680.

The previous prime is 1918843973. The next prime is 1918844003. The reversal of 1918843990 is 993488191.

It is a super-3 number, since 3×1918843990³ (a number of 29 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 220930 + ... + 229450.

It is an arithmetic number, because the mean of its divisors is an integer number (123407082).

Almost surely, 2^1918843990 is an apocalyptic number.

1918843990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1918843990 is an abundant number, since it is smaller than the sum of its proper divisors (2030182634).

1918843990 is a wasteful number, since it uses less digits than its factorization.

1918843990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11752.

The product of its (nonzero) digits is 559872, while the sum is 52.

The square root of 1918843990 is about 43804.6115152275. The cubic root of 1918843990 is about 1242.6435084239.

The spelling of 1918843990 in words is "one billion, nine hundred eighteen million, eight hundred forty-three thousand, nine hundred ninety".