1251656 has 48 divisors (see below), whose sum is σ = 2845440. Its totient is φ = 514080.

The previous prime is 1251641. The next prime is 1251661. The reversal of 1251656 is 6561521.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12101 + ... + 12203.

It is an arithmetic number, because the mean of its divisors is an integer number (59280).

2^1251656 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1251656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1422720).

1251656 is an abundant number, since it is smaller than the sum of its proper divisors (1593784).

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

1251656 is a wasteful number, since it uses less digits than its factorization.

1251656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154 (or 143 counting only the distinct ones).

The product of its digits is 1800, while the sum is 26.

The square root of 1251656 is about 1118.7743293444. The cubic root of 1251656 is about 107.7692834281.

The spelling of 1251656 in words is "one million, two hundred fifty-one thousand, six hundred fifty-six".