1398161439 has 32 divisors (see below), whose sum is σ = 2134159040. Its totient is φ = 904006656.

The previous prime is 1398161437. The next prime is 1398161441. The reversal of 1398161439 is 9341618931.

1398161439 is a `hidden beast` number, since 139 + 81 + 6 + 1 + 439 = 666.

It is an interprime number because it is at equal distance from previous prime (1398161437) and next prime (1398161441).

It is not a de Polignac number, because 1398161439 - 2¹ = 1398161437 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1398161394 and 1398161403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1398161437) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 334587 + ... + 338739.

It is an arithmetic number, because the mean of its divisors is an integer number (66692470).

Almost surely, 2^1398161439 is an apocalyptic number.

1398161439 is a deficient number, since it is larger than the sum of its proper divisors (735997601).

1398161439 is a wasteful number, since it uses less digits than its factorization.

1398161439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4536 (or 4530 counting only the distinct ones).

The product of its digits is 139968, while the sum is 45.

The square root of 1398161439 is about 37391.9969913349. The cubic root of 1398161439 is about 1118.1990185392.

The spelling of 1398161439 in words is "one billion, three hundred ninety-eight million, one hundred sixty-one thousand, four hundred thirty-nine".