18502397 has 2 divisors, whose sum is σ = 18502398. Its totient is φ = 18502396.

The previous prime is 18502303. The next prime is 18502411. The reversal of 18502397 is 79320581.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15832441 + 2669956 = 3979^2 + 1634^2 .

It is a cyclic number.

It is not a de Polignac number, because 18502397 - 2¹² = 18498301 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18502597) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9251198 + 9251199.

It is an arithmetic number, because the mean of its divisors is an integer number (9251199).

Almost surely, 2^18502397 is an apocalyptic number.

It is an amenable number.

18502397 is a deficient number, since it is larger than the sum of its proper divisors (1).

18502397 is an equidigital number, since it uses as much as digits as its factorization.

18502397 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15120, while the sum is 35.

The square root of 18502397 is about 4301.4412700861. The cubic root of 18502397 is about 264.4900457587.

The spelling of 18502397 in words is "eighteen million, five hundred two thousand, three hundred ninety-seven".