263424381 has 12 divisors (see below), whose sum is σ = 386066016. Its totient is φ = 159650920.

The previous prime is 263424361. The next prime is 263424383. The reversal of 263424381 is 183424362.

It is not a de Polignac number, because 263424381 - 2¹¹ = 263422333 is a prime.

It is a super-2 number, since 2×263424381² = 138784809010466322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (263424383) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 362481 + ... + 363206.

It is an arithmetic number, because the mean of its divisors is an integer number (32172168).

Almost surely, 2^263424381 is an apocalyptic number.

It is an amenable number.

263424381 is a deficient number, since it is larger than the sum of its proper divisors (122641635).

263424381 is a wasteful number, since it uses less digits than its factorization.

263424381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 725712 (or 725701 counting only the distinct ones).

The product of its digits is 27648, while the sum is 33.

The square root of 263424381 is about 16230.3536930037. The cubic root of 263424381 is about 641.0402848831.

The spelling of 263424381 in words is "two hundred sixty-three million, four hundred twenty-four thousand, three hundred eighty-one".