1213881 has 8 divisors (see below), whose sum is σ = 1626240. Its totient is φ = 805392.

The previous prime is 1213879. The next prime is 1213897. The reversal of 1213881 is 1883121.

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

It is not a de Polignac number, because 1213881 - 2¹ = 1213879 is a prime.

It is a super-2 number, since 2×1213881² = 2947014164322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1213801) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 130 + ... + 1563.

It is an arithmetic number, because the mean of its divisors is an integer number (203280).

2^1213881 is an apocalyptic number.

It is an amenable number.

1213881 is a deficient number, since it is larger than the sum of its proper divisors (412359).

1213881 is a wasteful number, since it uses less digits than its factorization.

1213881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1935.

The product of its digits is 384, while the sum is 24.

The square root of 1213881 is about 1101.7626786200. The cubic root of 1213881 is about 106.6740305246.

The spelling of 1213881 in words is "one million, two hundred thirteen thousand, eight hundred eighty-one".