1256402433 has 16 divisors (see below), whose sum is σ = 1968071616. Its totient is φ = 702882240.

The previous prime is 1256402431. The next prime is 1256402437. The reversal of 1256402433 is 3342046521.

It is not a de Polignac number, because 1256402433 - 2¹ = 1256402431 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1256402433.

It is not an unprimeable number, because it can be changed into a prime (1256402431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1463910 + ... + 1464767.

It is an arithmetic number, because the mean of its divisors is an integer number (123004476).

Almost surely, 2^1256402433 is an apocalyptic number.

1256402433 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1256402433 is a deficient number, since it is larger than the sum of its proper divisors (711669183).

1256402433 is a wasteful number, since it uses less digits than its factorization.

1256402433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2928704.

The product of its (nonzero) digits is 17280, while the sum is 30.

The square root of 1256402433 is about 35445.7674906328. The cubic root of 1256402433 is about 1079.0533637457.

Adding to 1256402433 its reverse (3342046521), we get a palindrome (4598448954).

The spelling of 1256402433 in words is "one billion, two hundred fifty-six million, four hundred two thousand, four hundred thirty-three".