1902091240 has 128 divisors (see below), whose sum is σ = 5299810560. Its totient is φ = 599445504.

The previous prime is 1902091187. The next prime is 1902091271. The reversal of 1902091240 is 421902091.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a junction number, because it is equal to n+sod(n) for n = 1902091199 and 1902091208.

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 31 ways as a sum of consecutive naturals, for example, 200034 + ... + 209326.

It is an arithmetic number, because the mean of its divisors is an integer number (41404770).

Almost surely, 2^1902091240 is an apocalyptic number.

1902091240 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 1902091240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2649905280).

1902091240 is an abundant number, since it is smaller than the sum of its proper divisors (3397719320).

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

1902091240 is a wasteful number, since it uses less digits than its factorization.

1902091240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9371 (or 9367 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 1902091240 is about 43612.9710063417. The cubic root of 1902091240 is about 1239.0165719791.

The spelling of 1902091240 in words is "one billion, nine hundred two million, ninety-one thousand, two hundred forty".