1256138 has 8 divisors (see below), whose sum is σ = 2029188. Its totient is φ = 579744.

The previous prime is 1256107. The next prime is 1256149. The reversal of 1256138 is 8316521.

It can be written as a sum of positive squares in 2 ways, for example, as 1138489 + 117649 = 1067^2 + 343^2 .

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

It is a Harshad number since it is a multiple of its sum of digits (26), and also a Moran number because the ratio is a prime number: 48313 = 1256138 / (1 + 2 + 5 + 6 + 1 + 3 + 8).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24131 + ... + 24182.

2^1256138 is an apocalyptic number.

1256138 is a deficient number, since it is larger than the sum of its proper divisors (773050).

1256138 is a wasteful number, since it uses less digits than its factorization.

1256138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48328.

The product of its digits is 1440, while the sum is 26.

The square root of 1256138 is about 1120.7756242888. The cubic root of 1256138 is about 107.8977656225.

The spelling of 1256138 in words is "one million, two hundred fifty-six thousand, one hundred thirty-eight".