18893977 has 2 divisors, whose sum is σ = 18893978. Its totient is φ = 18893976.

The previous prime is 18893947. The next prime is 18893981. The reversal of 18893977 is 77939881.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14318656 + 4575321 = 3784^2 + 2139^2 .

It is a cyclic number.

It is not a de Polignac number, because 18893977 - 2¹⁵ = 18861209 is a prime.

It is not a weakly prime, because it can be changed into another prime (18893947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9446988 + 9446989.

It is an arithmetic number, because the mean of its divisors is an integer number (9446989).

Almost surely, 2^18893977 is an apocalyptic number.

It is an amenable number.

18893977 is a deficient number, since it is larger than the sum of its proper divisors (1).

18893977 is an equidigital number, since it uses as much as digits as its factorization.

18893977 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 762048, while the sum is 52.

The square root of 18893977 is about 4346.7202578496. The cubic root of 18893977 is about 266.3429020361.

The spelling of 18893977 in words is "eighteen million, eight hundred ninety-three thousand, nine hundred seventy-seven".