1251630 has 24 divisors (see below), whose sum is σ = 3254472. Its totient is φ = 333744.

The previous prime is 1251583. The next prime is 1251641. The reversal of 1251630 is 361521.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a Curzon number.

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, 6864 + ... + 7043.

It is an arithmetic number, because the mean of its divisors is an integer number (135603).

2^1251630 is an apocalyptic number.

1251630 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1251630 is an abundant number, since it is smaller than the sum of its proper divisors (2002842).

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

1251630 is a wasteful number, since it uses less digits than its factorization.

1251630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13920 (or 13917 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 18.

The square root of 1251630 is about 1118.7627094250. The cubic root of 1251630 is about 107.7685372112.

It can be divided in two parts, 1251 and 630, that added together give a palindrome (1881).

The spelling of 1251630 in words is "one million, two hundred fifty-one thousand, six hundred thirty".