19428874 has 4 divisors (see below), whose sum is σ = 29143314. Its totient is φ = 9714436.

The previous prime is 19428863. The next prime is 19428883. The reversal of 19428874 is 47882491.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 47882491 = 149 ⋅321359.

It can be written as a sum of positive squares in only one way, i.e., 19421649 + 7225 = 4407^2 + 85^2 .

It is a super-2 number, since 2×19428874² = 754962289815752, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 19428874.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4857217 + ... + 4857220.

Almost surely, 2^19428874 is an apocalyptic number.

19428874 is a deficient number, since it is larger than the sum of its proper divisors (9714440).

19428874 is an equidigital number, since it uses as much as digits as its factorization.

19428874 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9714439.

The product of its digits is 129024, while the sum is 43.

The square root of 19428874 is about 4407.8196424083. The cubic root of 19428874 is about 268.8329785956.

It can be divided in two parts, 19428 and 874, that added together give a palindrome (20302).

The spelling of 19428874 in words is "nineteen million, four hundred twenty-eight thousand, eight hundred seventy-four".