1900000920 has 128 divisors (see below), whose sum is σ = 6048872640. Its totient is φ = 475791360.

The previous prime is 1900000919. The next prime is 1900000979. The reversal of 1900000920 is 290000091.

It is a happy number.

It is a Cunningham number, because it is equal to 43589²-1.

It is a super-2 number, since 2×1900000920² = 7220006992001692800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1306914 + ... + 1308366.

Almost surely, 2^1900000920 is an apocalyptic number.

1900000920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1900000920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3024436320).

1900000920 is an abundant number, since it is smaller than the sum of its proper divisors (4148871720).

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

1900000920 is a wasteful number, since it uses less digits than its factorization.

1900000920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2125 (or 2121 counting only the distinct ones).

The product of its (nonzero) digits is 162, while the sum is 21.

The square root of 1900000920 is about 43588.9999885292. Note that the first 4 decimals coincide. The cubic root of 1900000920 is about 1238.5625295384.

The spelling of 1900000920 in words is "one billion, nine hundred million, nine hundred twenty", and thus it is an aban number.