1398205447 has 4 divisors (see below), whose sum is σ = 1398557880. Its totient is φ = 1397853016.

The previous prime is 1398205381. The next prime is 1398205451. The reversal of 1398205447 is 7445028931.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1398205447 - 2²⁷ = 1263987719 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 (1398205147) 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, 170197 + ... + 178222.

It is an arithmetic number, because the mean of its divisors is an integer number (349639470).

Almost surely, 2^1398205447 is an apocalyptic number.

1398205447 is a deficient number, since it is larger than the sum of its proper divisors (352433).

1398205447 is an equidigital number, since it uses as much as digits as its factorization.

1398205447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 352432.

The product of its (nonzero) digits is 241920, while the sum is 43.

The square root of 1398205447 is about 37392.5854548733. The cubic root of 1398205447 is about 1118.2107504190.

The spelling of 1398205447 in words is "one billion, three hundred ninety-eight million, two hundred five thousand, four hundred forty-seven".