263993897 has 4 divisors (see below), whose sum is σ = 265376256. Its totient is φ = 262611540.

The previous prime is 263993831. The next prime is 263993911. The reversal of 263993897 is 798399362.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 263993897 - 2¹² = 263989801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (263993827) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 690893 + ... + 691274.

It is an arithmetic number, because the mean of its divisors is an integer number (66344064).

Almost surely, 2^263993897 is an apocalyptic number.

It is an amenable number.

263993897 is a deficient number, since it is larger than the sum of its proper divisors (1382359).

263993897 is a wasteful number, since it uses less digits than its factorization.

263993897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1382358.

The product of its digits is 4408992, while the sum is 56.

The square root of 263993897 is about 16247.8890013441. The cubic root of 263993897 is about 641.5019226323.

The spelling of 263993897 in words is "two hundred sixty-three million, nine hundred ninety-three thousand, eight hundred ninety-seven".