1081904393 has 2 divisors, whose sum is σ = 1081904394. Its totient is φ = 1081904392.

The previous prime is 1081904377. The next prime is 1081904413. The reversal of 1081904393 is 3934091801.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 862479424 + 219424969 = 29368^2 + 14813^2 .

It is a cyclic number.

It is not a de Polignac number, because 1081904393 - 2⁴ = 1081904377 is a prime.

It is not a weakly prime, because it can be changed into another prime (1081904093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 540952196 + 540952197.

It is an arithmetic number, because the mean of its divisors is an integer number (540952197).

Almost surely, 2^1081904393 is an apocalyptic number.

It is an amenable number.

1081904393 is a deficient number, since it is larger than the sum of its proper divisors (1).

1081904393 is an equidigital number, since it uses as much as digits as its factorization.

1081904393 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23328, while the sum is 38.

The square root of 1081904393 is about 32892.3151055075. The cubic root of 1081904393 is about 1026.5882631957.

The spelling of 1081904393 in words is "one billion, eighty-one million, nine hundred four thousand, three hundred ninety-three".