1261404 has 36 divisors (see below), whose sum is σ = 3278184. Its totient is φ = 408672.

The previous prime is 1261387. The next prime is 1261411. The reversal of 1261404 is 4041621.

1261404 is a `hidden beast` number, since 1 + 261 + 404 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×1261404² = 3182280102432, which contains 22 as substring.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 859 + ... + 1805.

2^1261404 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 1261404, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1639092).

1261404 is an abundant number, since it is smaller than the sum of its proper divisors (2016780).

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

1261404 is a wasteful number, since it uses less digits than its factorization.

1261404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 994 (or 989 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 1261404 is about 1123.1224332191. The cubic root of 1261404 is about 108.0483322765.

It can be divided in two parts, 12 and 61404, that added together give a palindrome (61416).

The spelling of 1261404 in words is "one million, two hundred sixty-one thousand, four hundred four".