1056943994 has 4 divisors (see below), whose sum is σ = 1585415994. Its totient is φ = 528471996.

The previous prime is 1056943991. The next prime is 1056944003. The reversal of 1056943994 is 4993496501.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 4993496501 = 7 ⋅713356643.

It can be written as a sum of positive squares in only one way, i.e., 1032786769 + 24157225 = 32137^2 + 4915^2 .

It is a super-2 number, since 2×1056943994² = 2234261212905344072, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1056943991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 264235997 + ... + 264236000.

Almost surely, 2^1056943994 is an apocalyptic number.

1056943994 is a deficient number, since it is larger than the sum of its proper divisors (528472000).

1056943994 is an equidigital number, since it uses as much as digits as its factorization.

1056943994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 528471999.

The product of its (nonzero) digits is 1049760, while the sum is 50.

The square root of 1056943994 is about 32510.6750775803. The cubic root of 1056943994 is about 1018.6320230024.

The spelling of 1056943994 in words is "one billion, fifty-six million, nine hundred forty-three thousand, nine hundred ninety-four".