1397944445 has 4 divisors (see below), whose sum is σ = 1677533340. Its totient is φ = 1118355552.

The previous prime is 1397944441. The next prime is 1397944451. The reversal of 1397944445 is 5444497931.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5444497931 = 36629 ⋅148639.

It can be written as a sum of positive squares in 2 ways, for example, as 531348601 + 866595844 = 23051^2 + 29438^2 .

It is a cyclic number.

It is not a de Polignac number, because 1397944445 - 2² = 1397944441 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1397944393 and 1397944402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1397944441) 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, 139794440 + ... + 139794449.

It is an arithmetic number, because the mean of its divisors is an integer number (419383335).

Almost surely, 2^1397944445 is an apocalyptic number.

It is an amenable number.

1397944445 is a deficient number, since it is larger than the sum of its proper divisors (279588895).

1397944445 is an equidigital number, since it uses as much as digits as its factorization.

1397944445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 279588894.

The product of its digits is 2177280, while the sum is 50.

The square root of 1397944445 is about 37389.0952685405. The cubic root of 1397944445 is about 1118.1411675584.

The spelling of 1397944445 in words is "one billion, three hundred ninety-seven million, nine hundred forty-four thousand, four hundred forty-five".