1263742427 has 4 divisors (see below), whose sum is σ = 1266674976. Its totient is φ = 1260809880.

The previous prime is 1263742399. The next prime is 1263742433. The reversal of 1263742427 is 7242473621.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1263742427 - 2⁸ = 1263742171 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1263742477) 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, 1465628 + ... + 1466489.

It is an arithmetic number, because the mean of its divisors is an integer number (316668744).

Almost surely, 2^1263742427 is an apocalyptic number.

1263742427 is a deficient number, since it is larger than the sum of its proper divisors (2932549).

1263742427 is an equidigital number, since it uses as much as digits as its factorization.

1263742427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2932548.

The product of its digits is 112896, while the sum is 38.

The square root of 1263742427 is about 35549.1550813799. The cubic root of 1263742427 is about 1081.1505876191.

The spelling of 1263742427 in words is "one billion, two hundred sixty-three million, seven hundred forty-two thousand, four hundred twenty-seven".