1894129493 has 8 divisors (see below), whose sum is σ = 1945871928. Its totient is φ = 1842416064.

The previous prime is 1894129459. The next prime is 1894129507. The reversal of 1894129493 is 3949214981.

It can be written as a sum of positive squares in 4 ways, for example, as 28494244 + 1865635249 = 5338^2 + 43193^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1894129493 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1894129793) 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 7 ways as a sum of consecutive naturals, for example, 224255 + ... + 232547.

It is an arithmetic number, because the mean of its divisors is an integer number (243233991).

Almost surely, 2^1894129493 is an apocalyptic number.

It is an amenable number.

1894129493 is a deficient number, since it is larger than the sum of its proper divisors (51742435).

1894129493 is an equidigital number, since it uses as much as digits as its factorization.

1894129493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14503.

The product of its digits is 559872, while the sum is 50.

The square root of 1894129493 is about 43521.5980060475. The cubic root of 1894129493 is about 1237.2854015255.

The spelling of 1894129493 in words is "one billion, eight hundred ninety-four million, one hundred twenty-nine thousand, four hundred ninety-three".