1256340134 has 16 divisors (see below), whose sum is σ = 2170687488. Its totient is φ = 534191112.

The previous prime is 1256340121. The next prime is 1256340139. The reversal of 1256340134 is 4310436521.

It is a junction number, because it is equal to n+sod(n) for n = 1256340097 and 1256340106.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1256340139) 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, 351524 + ... + 355079.

It is an arithmetic number, because the mean of its divisors is an integer number (135667968).

Almost surely, 2^1256340134 is an apocalyptic number.

1256340134 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

1256340134 is a deficient number, since it is larger than the sum of its proper divisors (914347354).

1256340134 is a wasteful number, since it uses less digits than its factorization.

1256340134 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 706739.

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 1256340134 is about 35444.8886865229. Note that the first 3 decimals coincide. The cubic root of 1256340134 is about 1079.0355284155.

Adding to 1256340134 its reverse (4310436521), we get a palindrome (5566776655).

The spelling of 1256340134 in words is "one billion, two hundred fifty-six million, three hundred forty thousand, one hundred thirty-four".