18961793 has 2 divisors, whose sum is σ = 18961794. Its totient is φ = 18961792.

The previous prime is 18961771. The next prime is 18961807. The reversal of 18961793 is 39716981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18593344 + 368449 = 4312^2 + 607^2 .

It is a cyclic number.

It is not a de Polignac number, because 18961793 - 2¹⁶ = 18896257 is a prime.

It is not a weakly prime, because it can be changed into another prime (18961193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9480896 + 9480897.

It is an arithmetic number, because the mean of its divisors is an integer number (9480897).

Almost surely, 2^18961793 is an apocalyptic number.

It is an amenable number.

18961793 is a deficient number, since it is larger than the sum of its proper divisors (1).

18961793 is an equidigital number, since it uses as much as digits as its factorization.

18961793 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 81648, while the sum is 44.

The square root of 18961793 is about 4354.5140945920. The cubic root of 18961793 is about 266.6611823525.

It can be divided in two parts, 1896 and 1793, that multiplied together give a triangular number (3399528 = T₂₆₀₇).

The spelling of 18961793 in words is "eighteen million, nine hundred sixty-one thousand, seven hundred ninety-three".