1256420102 has 16 divisors (see below), whose sum is σ = 2154539520. Its totient is φ = 538296648.

The previous prime is 1256420051. The next prime is 1256420107. The reversal of 1256420102 is 2010246521.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1256420107) 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, 38963 + ... + 63489.

It is an arithmetic number, because the mean of its divisors is an integer number (134658720).

Almost surely, 2^1256420102 is an apocalyptic number.

1256420102 is a deficient number, since it is larger than the sum of its proper divisors (898119418).

1256420102 is a wasteful number, since it uses less digits than its factorization.

1256420102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28195.

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 1256420102 is about 35446.0167296694. The cubic root of 1256420102 is about 1079.0584220253.

Adding to 1256420102 its reverse (2010246521), we get a palindrome (3266666623).

The spelling of 1256420102 in words is "one billion, two hundred fifty-six million, four hundred twenty thousand, one hundred two".