1917738897 has 32 divisors (see below), whose sum is σ = 2725493760. Its totient is φ = 1197685440.

The previous prime is 1917738877. The next prime is 1917738899. The reversal of 1917738897 is 7988377191.

It is not a de Polignac number, because 1917738897 - 2¹⁰ = 1917737873 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1917738897.

It is not an unprimeable number, because it can be changed into a prime (1917738899) 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 31 ways as a sum of consecutive naturals, for example, 336054 + ... + 341712.

It is an arithmetic number, because the mean of its divisors is an integer number (85171680).

Almost surely, 2^1917738897 is an apocalyptic number.

It is an amenable number.

1917738897 is a deficient number, since it is larger than the sum of its proper divisors (807754863).

1917738897 is a wasteful number, since it uses less digits than its factorization.

1917738897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5813.

The product of its digits is 5334336, while the sum is 60.

The square root of 1917738897 is about 43791.9958097367. The cubic root of 1917738897 is about 1242.4049098446.

The spelling of 1917738897 in words is "one billion, nine hundred seventeen million, seven hundred thirty-eight thousand, eight hundred ninety-seven".