1931869420 has 72 divisors (see below), whose sum is σ = 4437281520. Its totient is φ = 706118400.

The previous prime is 1931869411. The next prime is 1931869421. The reversal of 1931869420 is 249681391.

It is a happy number.

It is a super-2 number, since 2×1931869420² = 7464238911862272800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1931869421) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 338551 + ... + 344209.

It is an arithmetic number, because the mean of its divisors is an integer number (61628910).

Almost surely, 2^1931869420 is an apocalyptic number.

1931869420 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 1931869420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2218640760).

1931869420 is an abundant number, since it is smaller than the sum of its proper divisors (2505412100).

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

1931869420 is a wasteful number, since it uses less digits than its factorization.

1931869420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5795 (or 5780 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 43.

The square root of 1931869420 is about 43953.0365276394. The cubic root of 1931869420 is about 1245.4489265606.

The spelling of 1931869420 in words is "one billion, nine hundred thirty-one million, eight hundred sixty-nine thousand, four hundred twenty".