263139949 has 8 divisors (see below), whose sum is σ = 277151840. Its totient is φ = 249144336.

The previous prime is 263139931. The next prime is 263139959. The reversal of 263139949 is 949931362.

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

It is a cyclic number.

It is not a de Polignac number, because 263139949 - 2⁵ = 263139917 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 263139899 and 263139908.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (263139959) 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, 43462 + ... + 49144.

It is an arithmetic number, because the mean of its divisors is an integer number (34643980).

Almost surely, 2^263139949 is an apocalyptic number.

It is an amenable number.

263139949 is a deficient number, since it is larger than the sum of its proper divisors (14011891).

263139949 is a wasteful number, since it uses less digits than its factorization.

263139949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8139.

The product of its digits is 314928, while the sum is 46.

The square root of 263139949 is about 16221.5889788886. The cubic root of 263139949 is about 640.8094810962.

The spelling of 263139949 in words is "two hundred sixty-three million, one hundred thirty-nine thousand, nine hundred forty-nine".