19155242 has 4 divisors (see below), whose sum is σ = 28732866. Its totient is φ = 9577620.

The previous prime is 19155239. The next prime is 19155289. The reversal of 19155242 is 24255191.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24255191 = 19 ⋅1276589.

It can be written as a sum of positive squares in only one way, i.e., 19088161 + 67081 = 4369^2 + 259^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4788809 + ... + 4788812.

Almost surely, 2^19155242 is an apocalyptic number.

19155242 is a deficient number, since it is larger than the sum of its proper divisors (9577624).

19155242 is an equidigital number, since it uses as much as digits as its factorization.

19155242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9577623.

The product of its digits is 3600, while the sum is 29.

The square root of 19155242 is about 4376.6701954797. The cubic root of 19155242 is about 267.5649453628.

The spelling of 19155242 in words is "nineteen million, one hundred fifty-five thousand, two hundred forty-two".