1047821457 has 4 divisors (see below), whose sum is σ = 1397095280. Its totient is φ = 698547636.

The previous prime is 1047821413. The next prime is 1047821459. The reversal of 1047821457 is 7541287401.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1047821457 - 2²² = 1043627153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1047821459) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 174636907 + ... + 174636912.

It is an arithmetic number, because the mean of its divisors is an integer number (349273820).

Almost surely, 2^1047821457 is an apocalyptic number.

It is an amenable number.

1047821457 is a deficient number, since it is larger than the sum of its proper divisors (349273823).

1047821457 is an equidigital number, since it uses as much as digits as its factorization.

1047821457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 349273822.

The product of its (nonzero) digits is 62720, while the sum is 39.

The square root of 1047821457 is about 32370.0703891728. The cubic root of 1047821457 is about 1015.6929294109.

The spelling of 1047821457 in words is "one billion, forty-seven million, eight hundred twenty-one thousand, four hundred fifty-seven".