1898479421 has 2 divisors, whose sum is σ = 1898479422. Its totient is φ = 1898479420.

The previous prime is 1898479397. The next prime is 1898479459. The reversal of 1898479421 is 1249748981.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1158040900 + 740438521 = 34030^2 + 27211^2 .

It is a cyclic number.

It is not a de Polignac number, because 1898479421 - 2³⁰ = 824737597 is a prime.

It is a super-2 number, since 2×1898479421² = 7208448223920990482, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1898479481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 949239710 + 949239711.

It is an arithmetic number, because the mean of its divisors is an integer number (949239711).

Almost surely, 2^1898479421 is an apocalyptic number.

It is an amenable number.

1898479421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1898479421 is an equidigital number, since it uses as much as digits as its factorization.

1898479421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1161216, while the sum is 53.

The square root of 1898479421 is about 43571.5437068736. The cubic root of 1898479421 is about 1238.2318323485.

The spelling of 1898479421 in words is "one billion, eight hundred ninety-eight million, four hundred seventy-nine thousand, four hundred twenty-one".