1909898337940 has 12 divisors (see below), whose sum is σ = 4010786509716. Its totient is φ = 763959335168.

The previous prime is 1909898337913. The next prime is 1909898337947. The reversal of 1909898337940 is 497338989091.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1503512487684 + 406385850256 = 1226178^2 + 637484^2 .

It is a super-2 number, since 2×1909898337940² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1909898337940.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1909898337947) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47747458429 + ... + 47747458468.

It is an arithmetic number, because the mean of its divisors is an integer number (334232209143).

Almost surely, 2^{1909898337940} is an apocalyptic number.

1909898337940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1909898337940 is an abundant number, since it is smaller than the sum of its proper divisors (2100888171776).

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

1909898337940 is a wasteful number, since it uses less digits than its factorization.

1909898337940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95494916906 (or 95494916904 counting only the distinct ones).

The product of its (nonzero) digits is 105815808, while the sum is 70.

The spelling of 1909898337940 in words is "one trillion, nine hundred nine billion, eight hundred ninety-eight million, three hundred thirty-seven thousand, nine hundred forty".