1212381 has 16 divisors (see below), whose sum is σ = 1821120. Its totient is φ = 797040.

The previous prime is 1212373. The next prime is 1212397. The reversal of 1212381 is 1832121.

It is not a de Polignac number, because 1212381 - 2³ = 1212373 is a prime.

It is a super-2 number, since 2×1212381² = 2939735378322, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212301) 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, 1971 + ... + 2511.

It is an arithmetic number, because the mean of its divisors is an integer number (113820).

2^1212381 is an apocalyptic number.

It is an amenable number.

1212381 is a deficient number, since it is larger than the sum of its proper divisors (608739).

1212381 is an equidigital number, since it uses as much as digits as its factorization.

1212381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 633 (or 627 counting only the distinct ones).

The product of its digits is 96, while the sum is 18.

The square root of 1212381 is about 1101.0817408349. The cubic root of 1212381 is about 106.6300731680.

The spelling of 1212381 in words is "one million, two hundred twelve thousand, three hundred eighty-one".