19428455 has 4 divisors (see below), whose sum is σ = 23314152. Its totient is φ = 15542760.

The previous prime is 19428449. The next prime is 19428457. The reversal of 19428455 is 55482491.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 55482491 = 617 ⋅89923.

It is not a de Polignac number, because 19428455 - 2²⁴ = 2651239 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19428457) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1942841 + ... + 1942850.

It is an arithmetic number, because the mean of its divisors is an integer number (5828538).

Almost surely, 2^19428455 is an apocalyptic number.

19428455 is a deficient number, since it is larger than the sum of its proper divisors (3885697).

19428455 is an equidigital number, since it uses as much as digits as its factorization.

19428455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3885696.

The product of its digits is 57600, while the sum is 38.

The square root of 19428455 is about 4407.7721129841. The cubic root of 19428455 is about 268.8310460453.

The spelling of 19428455 in words is "nineteen million, four hundred twenty-eight thousand, four hundred fifty-five".