1213785790420 has 72 divisors (see below), whose sum is σ = 2965296920544. Its totient is φ = 416128233024.

The previous prime is 1213785790391. The next prime is 1213785790471. The reversal of 1213785790420 is 240975873121.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20514199 + ... + 20573281.

It is an arithmetic number, because the mean of its divisors is an integer number (41184679452).

Almost surely, 2^{1213785790420} is an apocalyptic number.

1213785790420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1213785790420 is an abundant number, since it is smaller than the sum of its proper divisors (1751511130124).

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

1213785790420 is a wasteful number, since it uses less digits than its factorization.

1213785790420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80069 (or 80060 counting only the distinct ones).

The product of its (nonzero) digits is 846720, while the sum is 49.

The spelling of 1213785790420 in words is "one trillion, two hundred thirteen billion, seven hundred eighty-five million, seven hundred ninety thousand, four hundred twenty".