1398445965 has 40 divisors (see below), whose sum is σ = 2864970240. Its totient is φ = 639288288.

The previous prime is 1398445933. The next prime is 1398445967. The reversal of 1398445965 is 5695448931.

1398445965 is a `hidden beast` number, since 1 + 3 + 9 + 8 + 44 + 596 + 5 = 666.

It is not a de Polignac number, because 1398445965 - 2⁵ = 1398445933 is a prime.

It is a super-2 number, since 2×1398445965² = 3911302234049562450, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1398445967) 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 39 ways as a sum of consecutive naturals, for example, 243805 + ... + 249474.

It is an arithmetic number, because the mean of its divisors is an integer number (71624256).

Almost surely, 2^1398445965 is an apocalyptic number.

1398445965 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1398445965 is an abundant number, since it is smaller than the sum of its proper divisors (1466524275).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1398445965 is an equidigital number, since it uses as much as digits as its factorization.

1398445965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 493303 (or 493294 counting only the distinct ones).

The product of its digits is 4665600, while the sum is 54.

The square root of 1398445965 is about 37395.8014354553. The cubic root of 1398445965 is about 1118.2748646005.

The spelling of 1398445965 in words is "one billion, three hundred ninety-eight million, four hundred forty-five thousand, nine hundred sixty-five".