1204897905 has 12 divisors (see below), whose sum is σ = 2088489780. Its totient is φ = 642612192.

The previous prime is 1204897879. The next prime is 1204897921. The reversal of 1204897905 is 5097984021.

It can be written as a sum of positive squares in 2 ways, for example, as 863830881 + 341067024 = 29391^2 + 18468^2 .

It is not a de Polignac number, because 1204897905 - 2¹⁰ = 1204896881 is a prime.

It is a super-2 number, since 2×1204897905² = 2903557922946778050, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 26775509 = 1204897905 / (1 + 2 + 0 + 4 + 8 + 9 + 7 + 9 + 0 + 5).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13387710 + ... + 13387799.

It is an arithmetic number, because the mean of its divisors is an integer number (174040815).

Almost surely, 2^1204897905 is an apocalyptic number.

1204897905 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1204897905 is a deficient number, since it is larger than the sum of its proper divisors (883591875).

1204897905 is a wasteful number, since it uses less digits than its factorization.

1204897905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26775520 (or 26775517 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 45.

The square root of 1204897905 is about 34711.6393303457. The cubic root of 1204897905 is about 1064.1023845853.

The spelling of 1204897905 in words is "one billion, two hundred four million, eight hundred ninety-seven thousand, nine hundred five".