1057420993 has 4 divisors (see below), whose sum is σ = 1079919360. Its totient is φ = 1034922628.

The previous prime is 1057420979. The next prime is 1057421009. The reversal of 1057420993 is 3990247501.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1057420993 is a prime.

It is a super-2 number, since 2×1057420993² = 2236278312874212098, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1057420933) 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, 11249113 + ... + 11249206.

It is an arithmetic number, because the mean of its divisors is an integer number (269979840).

Almost surely, 2^1057420993 is an apocalyptic number.

It is an amenable number.

1057420993 is a deficient number, since it is larger than the sum of its proper divisors (22498367).

1057420993 is an equidigital number, since it uses as much as digits as its factorization.

1057420993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22498366.

The product of its (nonzero) digits is 68040, while the sum is 40.

The square root of 1057420993 is about 32518.0102866089. The cubic root of 1057420993 is about 1018.7852362234.

The spelling of 1057420993 in words is "one billion, fifty-seven million, four hundred twenty thousand, nine hundred ninety-three".