19890280979340 has 48 divisors (see below), whose sum is σ = 55718848302432. Its totient is φ = 5301592874496.

The previous prime is 19890280979339. The next prime is 19890280979341. The reversal of 19890280979340 is 4397908209891.

It is an interprime number because it is at equal distance from previous prime (19890280979339) and next prime (19890280979341).

It is not an unprimeable number, because it can be changed into a prime (19890280979341) 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 15 ways as a sum of consecutive naturals, for example, 77434879 + ... + 77691318.

It is an arithmetic number, because the mean of its divisors is an integer number (1160809339634).

Almost surely, 2^{19890280979340} is an apocalyptic number.

19890280979340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19890280979340 is an abundant number, since it is smaller than the sum of its proper divisors (35828567323092).

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

19890280979340 is a wasteful number, since it uses less digits than its factorization.

19890280979340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155128346 (or 155128344 counting only the distinct ones).

The product of its (nonzero) digits is 70543872, while the sum is 69.

The spelling of 19890280979340 in words is "nineteen trillion, eight hundred ninety billion, two hundred eighty million, nine hundred seventy-nine thousand, three hundred forty".