1057978749 has 4 divisors (see below), whose sum is σ = 1410638336. Its totient is φ = 705319164.

The previous prime is 1057978723. The next prime is 1057978759. The reversal of 1057978749 is 9478797501.

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 1057978749 - 2¹⁷ = 1057847677 is a prime.

It is a super-2 number, since 2×1057978749² = 2238638066671210002, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1057978759) 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, 176329789 + ... + 176329794.

It is an arithmetic number, because the mean of its divisors is an integer number (352659584).

Almost surely, 2^1057978749 is an apocalyptic number.

It is an amenable number.

1057978749 is a deficient number, since it is larger than the sum of its proper divisors (352659587).

1057978749 is an equidigital number, since it uses as much as digits as its factorization.

1057978749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 352659586.

The product of its (nonzero) digits is 4445280, while the sum is 57.

The square root of 1057978749 is about 32526.5852649798. The cubic root of 1057978749 is about 1018.9643303599.

The spelling of 1057978749 in words is "one billion, fifty-seven million, nine hundred seventy-eight thousand, seven hundred forty-nine".