1251138 has 16 divisors (see below), whose sum is σ = 2859840. Its totient is φ = 357456.

The previous prime is 1251121. The next prime is 1251157. The reversal of 1251138 is 8311521.

It is a Harshad number since it is a multiple of its sum of digits (21).

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, 14853 + ... + 14936.

It is an arithmetic number, because the mean of its divisors is an integer number (178740).

2^1251138 is an apocalyptic number.

1251138 is an abundant number, since it is smaller than the sum of its proper divisors (1608702).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1251138 is a wasteful number, since it uses less digits than its factorization.

1251138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29801.

The product of its digits is 240, while the sum is 21.

The square root of 1251138 is about 1118.5428020420. The cubic root of 1251138 is about 107.7544145420.

Adding to 1251138 its reverse (8311521), we get a palindrome (9562659).

The spelling of 1251138 in words is "one million, two hundred fifty-one thousand, one hundred thirty-eight".