1919528940 has 144 divisors (see below), whose sum is σ = 6524243712. Its totient is φ = 419658624.

The previous prime is 1919528929. The next prime is 1919528953. The reversal of 1919528940 is 498259191.

It is a self number, because there is not a number n which added to its sum of digits gives 1919528940.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 53427 + ... + 81813.

It is an arithmetic number, because the mean of its divisors is an integer number (45307248).

Almost surely, 2^1919528940 is an apocalyptic number.

1919528940 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 1919528940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3262121856).

1919528940 is an abundant number, since it is smaller than the sum of its proper divisors (4604714772).

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

1919528940 is a wasteful number, since it uses less digits than its factorization.

1919528940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28436 (or 28427 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 48.

The square root of 1919528940 is about 43812.4290584304. The cubic root of 1919528940 is about 1242.7913487244.

The spelling of 1919528940 in words is "one billion, nine hundred nineteen million, five hundred twenty-eight thousand, nine hundred forty".