1398365649 has 24 divisors (see below), whose sum is σ = 2057852160. Its totient is φ = 914853888.

The previous prime is 1398365641. The next prime is 1398365681. The reversal of 1398365649 is 9465638931.

It is not a de Polignac number, because 1398365649 - 2³ = 1398365641 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1398365595 and 1398365604.

It is not an unprimeable number, because it can be changed into a prime (1398365641) 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 23 ways as a sum of consecutive naturals, for example, 112849 + ... + 124625.

It is an arithmetic number, because the mean of its divisors is an integer number (85743840).

Almost surely, 2^1398365649 is an apocalyptic number.

It is an amenable number.

1398365649 is a deficient number, since it is larger than the sum of its proper divisors (659486511).

1398365649 is a wasteful number, since it uses less digits than its factorization.

1398365649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12029 (or 12026 counting only the distinct ones).

The product of its digits is 4199040, while the sum is 54.

The square root of 1398365649 is about 37394.7275561676. The cubic root of 1398365649 is about 1118.2534558163.

The spelling of 1398365649 in words is "one billion, three hundred ninety-eight million, three hundred sixty-five thousand, six hundred forty-nine".