1898479397 has 2 divisors, whose sum is σ = 1898479398. Its totient is φ = 1898479396.

The previous prime is 1898479367. The next prime is 1898479421. The reversal of 1898479397 is 7939748981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1662519076 + 235960321 = 40774^2 + 15361^2 .

It is a cyclic number.

It is not a de Polignac number, because 1898479397 - 2⁶ = 1898479333 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1898479327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 949239698 + 949239699.

It is an arithmetic number, because the mean of its divisors is an integer number (949239699).

Almost surely, 2^1898479397 is an apocalyptic number.

It is an amenable number.

1898479397 is a deficient number, since it is larger than the sum of its proper divisors (1).

1898479397 is an equidigital number, since it uses as much as digits as its factorization.

1898479397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27433728, while the sum is 65.

The square root of 1898479397 is about 43571.5434314645. The cubic root of 1898479397 is about 1238.2318271308.

The spelling of 1898479397 in words is "one billion, eight hundred ninety-eight million, four hundred seventy-nine thousand, three hundred ninety-seven".