18429977 has 2 divisors, whose sum is σ = 18429978. Its totient is φ = 18429976.

The previous prime is 18429973. The next prime is 18429979. The reversal of 18429977 is 77992481.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16801801 + 1628176 = 4099^2 + 1276^2 .

It is a cyclic number.

It is not a de Polignac number, because 18429977 - 2² = 18429973 is a prime.

Together with 18429979, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18429973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9214988 + 9214989.

It is an arithmetic number, because the mean of its divisors is an integer number (9214989).

Almost surely, 2^18429977 is an apocalyptic number.

It is an amenable number.

18429977 is a deficient number, since it is larger than the sum of its proper divisors (1).

18429977 is an equidigital number, since it uses as much as digits as its factorization.

18429977 is an evil number, because the sum of its binary digits is even.

The product of its digits is 254016, while the sum is 47.

The square root of 18429977 is about 4293.0149079639. The cubic root of 18429977 is about 264.1445154972.

The spelling of 18429977 in words is "eighteen million, four hundred twenty-nine thousand, nine hundred seventy-seven".