1261398 has 8 divisors (see below), whose sum is σ = 2522808. Its totient is φ = 420464.

The previous prime is 1261387. The next prime is 1261411. The reversal of 1261398 is 8931621.

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

1261398 is an admirable number.

It is a super-2 number, since 2×1261398² = 3182249828808, which contains 22 as substring.

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 3 ways as a sum of consecutive naturals, for example, 105111 + ... + 105122.

It is an arithmetic number, because the mean of its divisors is an integer number (315351).

2^1261398 is an apocalyptic number.

1261398 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1261398 is a wasteful number, since it uses less digits than its factorization.

1261398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210238.

The product of its digits is 2592, while the sum is 30.

The square root of 1261398 is about 1123.1197620913. The cubic root of 1261398 is about 108.0481609619.

The spelling of 1261398 in words is "one million, two hundred sixty-one thousand, three hundred ninety-eight".