1897909225 has 9 divisors (see below), whose sum is σ = 2353677573. Its totient is φ = 1518153120.

The previous prime is 1897909217. The next prime is 1897909231. The reversal of 1897909225 is 5229097981.

The square root of 1897909225 is 43565.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 392158809 + 1505750416 = 19803^2 + 38804^2 .

It is not a de Polignac number, because 1897909225 - 2³ = 1897909217 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 213469 + ... + 222181.

Almost surely, 2^1897909225 is an apocalyptic number.

1897909225 is the 43565-th square number.

1897909225 is the 21783-rd centered octagonal number.

It is an amenable number.

1897909225 is a deficient number, since it is larger than the sum of its proper divisors (455768348).

1897909225 is an frugal number, since it uses more digits than its factorization.

1897909225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17436 (or 8718 counting only the distinct ones).

The product of its (nonzero) digits is 816480, while the sum is 52.

The cubic root of 1897909225 is about 1238.1078549650.

The spelling of 1897909225 in words is "one billion, eight hundred ninety-seven million, nine hundred nine thousand, two hundred twenty-five".