1289920840346 has 8 divisors (see below), whose sum is σ = 1934943016320. Its totient is φ = 644939834908.

The previous prime is 1289920840319. The next prime is 1289920840349. The reversal of 1289920840346 is 6430480299821.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-3 number, since 3×1289920840346³ (a number of 37 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1289920840291 and 1289920840300.

It is not an unprimeable number, because it can be changed into a prime (1289920840349) 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, 10214186 + ... + 10339701.

It is an arithmetic number, because the mean of its divisors is an integer number (241867877040).

Almost surely, 2^{1289920840346} is an apocalyptic number.

1289920840346 is a deficient number, since it is larger than the sum of its proper divisors (645022175974).

1289920840346 is a wasteful number, since it uses less digits than its factorization.

1289920840346 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20585268.

The product of its (nonzero) digits is 5971968, while the sum is 56.

The spelling of 1289920840346 in words is "one trillion, two hundred eighty-nine billion, nine hundred twenty million, eight hundred forty thousand, three hundred forty-six".