1263863890 has 16 divisors (see below), whose sum is σ = 2275879680. Its totient is φ = 505340080.

The previous prime is 1263863863. The next prime is 1263863891. The reversal of 1263863890 is 983683621.

It is a self number, because there is not a number n which added to its sum of digits gives 1263863890.

It is not an unprimeable number, because it can be changed into a prime (1263863891) 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, 1521 + ... + 50299.

It is an arithmetic number, because the mean of its divisors is an integer number (142242480).

Almost surely, 2^1263863890 is an apocalyptic number.

1263863890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1263863890 is a deficient number, since it is larger than the sum of its proper divisors (1012015790).

1263863890 is a wasteful number, since it uses less digits than its factorization.

1263863890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51377.

The product of its (nonzero) digits is 373248, while the sum is 46.

The square root of 1263863890 is about 35550.8634213010. The cubic root of 1263863890 is about 1081.1852243151.

The spelling of 1263863890 in words is "one billion, two hundred sixty-three million, eight hundred sixty-three thousand, eight hundred ninety".