1263790905 has 16 divisors (see below), whose sum is σ = 2177609280. Its totient is φ = 622173888.

The previous prime is 1263790903. The next prime is 1263790921. The reversal of 1263790905 is 5090973621.

It is not a de Polignac number, because 1263790905 - 2¹ = 1263790903 is a prime.

It is a super-3 number, since 3×1263790905³ (a number of 28 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (1263790901) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3240295 + ... + 3240684.

It is an arithmetic number, because the mean of its divisors is an integer number (136100580).

Almost surely, 2^1263790905 is an apocalyptic number.

1263790905 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1263790905 is a deficient number, since it is larger than the sum of its proper divisors (913818375).

1263790905 is a wasteful number, since it uses less digits than its factorization.

1263790905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6481000.

The product of its (nonzero) digits is 102060, while the sum is 42.

The square root of 1263790905 is about 35549.8369194572. The cubic root of 1263790905 is about 1081.1644119942.

The spelling of 1263790905 in words is "one billion, two hundred sixty-three million, seven hundred ninety thousand, nine hundred five".