1261858 has 8 divisors (see below), whose sum is σ = 2038428. Its totient is φ = 582384.

The previous prime is 1261837. The next prime is 1261861. The reversal of 1261858 is 8581621.

It can be written as a sum of positive squares in 2 ways, for example, as 1261129 + 729 = 1123^2 + 27^2 .

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

It is a super-2 number, since 2×1261858² = 3184571224328, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24241 + ... + 24292.

2^1261858 is an apocalyptic number.

1261858 is a deficient number, since it is larger than the sum of its proper divisors (776570).

1261858 is a wasteful number, since it uses less digits than its factorization.

1261858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48548.

The product of its digits is 3840, while the sum is 31.

The square root of 1261858 is about 1123.3245301337. The cubic root of 1261858 is about 108.0612935110.

The spelling of 1261858 in words is "one million, two hundred sixty-one thousand, eight hundred fifty-eight".