1247434457 has 4 divisors (see below), whose sum is σ = 1256539956. Its totient is φ = 1238328960.

The previous prime is 1247434427. The next prime is 1247434481. The reversal of 1247434457 is 7544347421.

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

It can be written as a sum of positive squares in 2 ways, for example, as 416323216 + 831111241 = 20404^2 + 28829^2 .

It is a cyclic number.

It is not a de Polignac number, because 1247434457 - 2⁶ = 1247434393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1247434427) 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, 4552544 + ... + 4552817.

It is an arithmetic number, because the mean of its divisors is an integer number (314134989).

Almost surely, 2^1247434457 is an apocalyptic number.

It is an amenable number.

1247434457 is a deficient number, since it is larger than the sum of its proper divisors (9105499).

1247434457 is an equidigital number, since it uses as much as digits as its factorization.

1247434457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9105498.

The product of its digits is 376320, while the sum is 41.

The square root of 1247434457 is about 35319.0381664054. The cubic root of 1247434457 is about 1076.4798675992.

The spelling of 1247434457 in words is "one billion, two hundred forty-seven million, four hundred thirty-four thousand, four hundred fifty-seven".