263121140 has 24 divisors (see below), whose sum is σ = 556910592. Its totient is φ = 104418720.

The previous prime is 263121119. The next prime is 263121143. The reversal of 263121140 is 41121362.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (263121143) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49256 + ... + 54335.

It is an arithmetic number, because the mean of its divisors is an integer number (23204608).

Almost surely, 2^263121140 is an apocalyptic number.

263121140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

263121140 is an abundant number, since it is smaller than the sum of its proper divisors (293789452).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

263121140 is a wasteful number, since it uses less digits than its factorization.

263121140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103727 (or 103725 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 263121140 is about 16221.0092164452. The cubic root of 263121140 is about 640.7942125762.

The spelling of 263121140 in words is "two hundred sixty-three million, one hundred twenty-one thousand, one hundred forty".