1251404 has 48 divisors (see below), whose sum is σ = 2903040. Its totient is φ = 456960.

The previous prime is 1251329. The next prime is 1251409. The reversal of 1251404 is 4041521.

1251404 = 392² + 393² + ... + 399².

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a plaindrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (1251409) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5117 + ... + 5355.

It is an arithmetic number, because the mean of its divisors is an integer number (60480).

2^1251404 is an apocalyptic number.

1251404 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1251404, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1451520).

1251404 is an abundant number, since it is smaller than the sum of its proper divisors (1651636).

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

1251404 is a wasteful number, since it uses less digits than its factorization.

1251404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 278 (or 276 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 1251404 is about 1118.6617004260. The cubic root of 1251404 is about 107.7620504285.

Adding to 1251404 its reverse (4041521), we get a palindrome (5292925).

The spelling of 1251404 in words is "one million, two hundred fifty-one thousand, four hundred four".