19453138 has 4 divisors (see below), whose sum is σ = 29179710. Its totient is φ = 9726568.

The previous prime is 19453129. The next prime is 19453141. The reversal of 19453138 is 83135491.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 83135491 = 17 ⋅4890323.

It can be written as a sum of positive squares in only one way, i.e., 11002489 + 8450649 = 3317^2 + 2907^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4863283 + ... + 4863286.

Almost surely, 2^19453138 is an apocalyptic number.

19453138 is a deficient number, since it is larger than the sum of its proper divisors (9726572).

19453138 is an equidigital number, since it uses as much as digits as its factorization.

19453138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9726571.

The product of its digits is 12960, while the sum is 34.

The square root of 19453138 is about 4410.5711648266. The cubic root of 19453138 is about 268.9448438851.

It can be divided in two parts, 19453 and 138, that added together give a palindrome (19591).

The spelling of 19453138 in words is "nineteen million, four hundred fifty-three thousand, one hundred thirty-eight".