1398239909 has 4 divisors (see below), whose sum is σ = 1525352640. Its totient is φ = 1271127180.

The previous prime is 1398239893. The next prime is 1398239923. The reversal of 1398239909 is 9099328931.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1398239909 - 2⁴ = 1398239893 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 (1398239939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63556349 + ... + 63556370.

It is an arithmetic number, because the mean of its divisors is an integer number (381338160).

Almost surely, 2^1398239909 is an apocalyptic number.

It is an amenable number.

1398239909 is a deficient number, since it is larger than the sum of its proper divisors (127112731).

1398239909 is a wasteful number, since it uses less digits than its factorization.

1398239909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127112730.

The product of its (nonzero) digits is 944784, while the sum is 53.

The square root of 1398239909 is about 37393.0462653152. The cubic root of 1398239909 is about 1118.2199373051.

The spelling of 1398239909 in words is "one billion, three hundred ninety-eight million, two hundred thirty-nine thousand, nine hundred nine".