1281825874 has 16 divisors (see below), whose sum is σ = 2326675968. Its totient is φ = 517038912.

The previous prime is 1281825871. The next prime is 1281825889. The reversal of 1281825874 is 4785281821.

It is not an unprimeable number, because it can be changed into a prime (1281825871) 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, 2692674 + ... + 2693149.

It is an arithmetic number, because the mean of its divisors is an integer number (145417248).

Almost surely, 2^1281825874 is an apocalyptic number.

1281825874 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

1281825874 is a deficient number, since it is larger than the sum of its proper divisors (1044850094).

1281825874 is a wasteful number, since it uses less digits than its factorization.

1281825874 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5385849.

The product of its digits is 286720, while the sum is 46.

The square root of 1281825874 is about 35802.5959114699. The cubic root of 1281825874 is about 1086.2830705766.

The spelling of 1281825874 in words is "one billion, two hundred eighty-one million, eight hundred twenty-five thousand, eight hundred seventy-four".