1256505442 has 8 divisors (see below), whose sum is σ = 1887310800. Its totient is φ = 627401844.

The previous prime is 1256505431. The next prime is 1256505443. The reversal of 1256505442 is 2445056521.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 1256505398 and 1256505407.

It is not an unprimeable number, because it can be changed into a prime (1256505443) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 423592 + ... + 426547.

It is an arithmetic number, because the mean of its divisors is an integer number (235913850).

Almost surely, 2^1256505442 is an apocalyptic number.

1256505442 is a deficient number, since it is larger than the sum of its proper divisors (630805358).

1256505442 is an equidigital number, since it uses as much as digits as its factorization.

1256505442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 850880.

The product of its (nonzero) digits is 48000, while the sum is 34.

The square root of 1256505442 is about 35447.2205116283. The cubic root of 1256505442 is about 1079.0828524847.

The spelling of 1256505442 in words is "one billion, two hundred fifty-six million, five hundred five thousand, four hundred forty-two".