18697955 has 4 divisors (see below), whose sum is σ = 22437552. Its totient is φ = 14958360.

The previous prime is 18697949. The next prime is 18697961. The reversal of 18697955 is 55979681.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 55979681 = 19 ⋅2946299.

It is an interprime number because it is at equal distance from previous prime (18697949) and next prime (18697961).

It is not a de Polignac number, because 18697955 - 2¹² = 18693859 is a prime.

It is a super-2 number, since 2×18697955² = 699227042364050, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1869791 + ... + 1869800.

It is an arithmetic number, because the mean of its divisors is an integer number (5609388).

Almost surely, 2^18697955 is an apocalyptic number.

18697955 is a deficient number, since it is larger than the sum of its proper divisors (3739597).

18697955 is an equidigital number, since it uses as much as digits as its factorization.

18697955 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3739596.

The product of its digits is 680400, while the sum is 50.

The square root of 18697955 is about 4324.1132038835. The cubic root of 18697955 is about 265.4186097805.

The spelling of 18697955 in words is "eighteen million, six hundred ninety-seven thousand, nine hundred fifty-five".