18957469 has 2 divisors, whose sum is σ = 18957470. Its totient is φ = 18957468.

The previous prime is 18957439. The next prime is 18957473. The reversal of 18957469 is 96475981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18922500 + 34969 = 4350^2 + 187^2 .

It is a cyclic number.

It is not a de Polignac number, because 18957469 - 2⁵ = 18957437 is a prime.

It is a super-2 number, since 2×18957469² = 718771261771922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18957409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9478734 + 9478735.

It is an arithmetic number, because the mean of its divisors is an integer number (9478735).

Almost surely, 2^18957469 is an apocalyptic number.

It is an amenable number.

18957469 is a deficient number, since it is larger than the sum of its proper divisors (1).

18957469 is an equidigital number, since it uses as much as digits as its factorization.

18957469 is an evil number, because the sum of its binary digits is even.

The product of its digits is 544320, while the sum is 49.

The square root of 18957469 is about 4354.0175700151. The cubic root of 18957469 is about 266.6409112278.

The spelling of 18957469 in words is "eighteen million, nine hundred fifty-seven thousand, four hundred sixty-nine".