1898204545 has 4 divisors (see below), whose sum is σ = 2277845460. Its totient is φ = 1518563632.

The previous prime is 1898204533. The next prime is 1898204563. The reversal of 1898204545 is 5454028981.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5454028981 = 3137 ⋅1738613.

It can be written as a sum of positive squares in 2 ways, for example, as 1165744449 + 732460096 = 34143^2 + 27064^2 .

It is a cyclic number.

It is not a de Polignac number, because 1898204545 - 2⁷ = 1898204417 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1898204495 and 1898204504.

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, 189820450 + ... + 189820459.

It is an arithmetic number, because the mean of its divisors is an integer number (569461365).

Almost surely, 2^1898204545 is an apocalyptic number.

It is an amenable number.

1898204545 is a deficient number, since it is larger than the sum of its proper divisors (379640915).

1898204545 is an equidigital number, since it uses as much as digits as its factorization.

1898204545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 379640914.

The product of its (nonzero) digits is 460800, while the sum is 46.

The square root of 1898204545 is about 43568.3892862704. The cubic root of 1898204545 is about 1238.1720693197.

The spelling of 1898204545 in words is "one billion, eight hundred ninety-eight million, two hundred four thousand, five hundred forty-five".