1918929990 has 32 divisors (see below), whose sum is σ = 4611538656. Its totient is φ = 511036160.

The previous prime is 1918929989. The next prime is 1918930073. The reversal of 1918929990 is 999298191.

It is a self number, because there is not a number n which added to its sum of digits gives 1918929990.

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, 19197 + ... + 64856.

It is an arithmetic number, because the mean of its divisors is an integer number (144110583).

Almost surely, 2^1918929990 is an apocalyptic number.

1918929990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1918929990 is an abundant number, since it is smaller than the sum of its proper divisors (2692608666).

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

1918929990 is a wasteful number, since it uses less digits than its factorization.

1918929990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84824.

The product of its (nonzero) digits is 944784, while the sum is 57.

The square root of 1918929990 is about 43805.5931360369. The cubic root of 1918929990 is about 1242.6620726820.

The spelling of 1918929990 in words is "one billion, nine hundred eighteen million, nine hundred twenty-nine thousand, nine hundred ninety".