263439145 has 8 divisors (see below), whose sum is σ = 323837640. Its totient is φ = 205610880.

The previous prime is 263439131. The next prime is 263439179. The reversal of 263439145 is 541934362.

It can be written as a sum of positive squares in 4 ways, for example, as 29073664 + 234365481 = 5392^2 + 15309^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 263439145 - 2²⁵ = 229884713 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 642330 + ... + 642739.

It is an arithmetic number, because the mean of its divisors is an integer number (40479705).

Almost surely, 2^263439145 is an apocalyptic number.

It is an amenable number.

263439145 is a deficient number, since it is larger than the sum of its proper divisors (60398495).

263439145 is a wasteful number, since it uses less digits than its factorization.

263439145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1285115.

The product of its digits is 77760, while the sum is 37.

The square root of 263439145 is about 16230.8085134413. The cubic root of 263439145 is about 641.0522606690.

The spelling of 263439145 in words is "two hundred sixty-three million, four hundred thirty-nine thousand, one hundred forty-five".