1897280345 has 8 divisors (see below), whose sum is σ = 2277126600. Its totient is φ = 1517564160.

The previous prime is 1897280323. The next prime is 1897280347. The reversal of 1897280345 is 5430827981.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 512026384 + 1385253961 = 22628^2 + 37219^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-1897280345 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1897280345.

It is not an unprimeable number, because it can be changed into a prime (1897280347) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3131 + ... + 61679.

It is an arithmetic number, because the mean of its divisors is an integer number (284640825).

Almost surely, 2^1897280345 is an apocalyptic number.

It is an amenable number.

1897280345 is a deficient number, since it is larger than the sum of its proper divisors (379846255).

1897280345 is an equidigital number, since it uses as much as digits as its factorization.

1897280345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65035.

The product of its (nonzero) digits is 483840, while the sum is 47.

The square root of 1897280345 is about 43557.7816813483. The cubic root of 1897280345 is about 1237.9710891539.

The spelling of 1897280345 in words is "one billion, eight hundred ninety-seven million, two hundred eighty thousand, three hundred forty-five".