1226920783890 has 16 divisors (see below), whose sum is σ = 2944609881408. Its totient is φ = 327178875696.

The previous prime is 1226920783871. The next prime is 1226920783897. The reversal of 1226920783890 is 983870296221.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 1226920783890.

It is not an unprimeable number, because it can be changed into a prime (1226920783897) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20448679702 + ... + 20448679761.

It is an arithmetic number, because the mean of its divisors is an integer number (184038117588).

Almost surely, 2^{1226920783890} is an apocalyptic number.

1226920783890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1226920783890 is an abundant number, since it is smaller than the sum of its proper divisors (1717689097518).

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

1226920783890 is a wasteful number, since it uses less digits than its factorization.

1226920783890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40897359473.

The product of its (nonzero) digits is 5225472, while the sum is 57.

The spelling of 1226920783890 in words is "one trillion, two hundred twenty-six billion, nine hundred twenty million, seven hundred eighty-three thousand, eight hundred ninety".