1930121000 has 64 divisors (see below), whose sum is σ = 4526832960. Its totient is φ = 770280000.

The previous prime is 1930120987. The next prime is 1930121003. The reversal of 1930121000 is 1210391.

It is a happy number.

1930121000 is nontrivially palindromic in base 13.

It is a self number, because there is not a number n which added to its sum of digits gives 1930121000.

It is not an unprimeable number, because it can be changed into a prime (1930121003) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 489035 + ... + 492965.

It is an arithmetic number, because the mean of its divisors is an integer number (70731765).

Almost surely, 2^1930121000 is an apocalyptic number.

1930121000 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 1930121000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2263416480).

1930121000 is an abundant number, since it is smaller than the sum of its proper divisors (2596711960).

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

1930121000 is a wasteful number, since it uses less digits than its factorization.

1930121000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4443 (or 4429 counting only the distinct ones).

The product of its (nonzero) digits is 54, while the sum is 17.

The square root of 1930121000 is about 43933.1423870408. The cubic root of 1930121000 is about 1245.0730859285.

Adding to 1930121000 its reverse (1210391), we get a palindrome (1931331391).

The spelling of 1930121000 in words is "one billion, nine hundred thirty million, one hundred twenty-one thousand".