1285126420 has 12 divisors (see below), whose sum is σ = 2698765524. Its totient is φ = 514050560.

The previous prime is 1285126399. The next prime is 1285126429. The reversal of 1285126420 is 246215821.

It can be written as a sum of positive squares in 2 ways, for example, as 442849936 + 842276484 = 21044^2 + 29022^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1285126429) 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, 32128141 + ... + 32128180.

It is an arithmetic number, because the mean of its divisors is an integer number (224897127).

Almost surely, 2^1285126420 is an apocalyptic number.

1285126420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1285126420 is an abundant number, since it is smaller than the sum of its proper divisors (1413639104).

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

1285126420 is a wasteful number, since it uses less digits than its factorization.

1285126420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64256330 (or 64256328 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 31.

The square root of 1285126420 is about 35848.6599470608. The cubic root of 1285126420 is about 1087.2146204981.

The spelling of 1285126420 in words is "one billion, two hundred eighty-five million, one hundred twenty-six thousand, four hundred twenty".