1285126442 has 4 divisors (see below), whose sum is σ = 1927689666. Its totient is φ = 642563220.

The previous prime is 1285126429. The next prime is 1285126481. The reversal of 1285126442 is 2446215821.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 960442081 + 324684361 = 30991^2 + 18019^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321281609 + ... + 321281612.

Almost surely, 2^1285126442 is an apocalyptic number.

1285126442 is a deficient number, since it is larger than the sum of its proper divisors (642563224).

1285126442 is an equidigital number, since it uses as much as digits as its factorization.

1285126442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 642563223.

The product of its digits is 30720, while the sum is 35.

The square root of 1285126442 is about 35848.6602539063. The cubic root of 1285126442 is about 1087.2146267021.

It can be divided in two parts, 12851 and 26442, that added together give a palindrome (39293).

The spelling of 1285126442 in words is "one billion, two hundred eighty-five million, one hundred twenty-six thousand, four hundred forty-two".