1263139 has 6 divisors (see below), whose sum is σ = 1333500. Its totient is φ = 1196316.

The previous prime is 1263133. The next prime is 1263173. The reversal of 1263139 is 9313621.

It is not a de Polignac number, because 1263139 - 2⁵ = 1263107 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1263133) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1389 + ... + 2110.

It is an arithmetic number, because the mean of its divisors is an integer number (222250).

2^1263139 is an apocalyptic number.

1263139 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

1263139 is a deficient number, since it is larger than the sum of its proper divisors (70361).

1263139 is an equidigital number, since it uses as much as digits as its factorization.

1263139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3537 (or 3518 counting only the distinct ones).

The product of its digits is 972, while the sum is 25.

The square root of 1263139 is about 1123.8945680089. The cubic root of 1263139 is about 108.0978479942.

The spelling of 1263139 in words is "one million, two hundred sixty-three thousand, one hundred thirty-nine".