1612381 has 4 divisors (see below), whose sum is σ = 1619712. Its totient is φ = 1605052.

The previous prime is 1612363. The next prime is 1612393. The reversal of 1612381 is 1832161.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1832161 = 107 ⋅17123.

It is a cyclic number.

It is not a de Polignac number, because 1612381 - 2¹¹ = 1610333 is a prime.

It is a super-2 number, since 2×1612381² = 5199544978322, which contains 22 as substring.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1612361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3325 + ... + 3778.

It is an arithmetic number, because the mean of its divisors is an integer number (404928).

2^1612381 is an apocalyptic number.

It is an amenable number.

1612381 is a deficient number, since it is larger than the sum of its proper divisors (7331).

1612381 is an equidigital number, since it uses as much as digits as its factorization.

1612381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7330.

The product of its digits is 288, while the sum is 22.

The square root of 1612381 is about 1269.7956528513. The cubic root of 1612381 is about 117.2616202267.

The spelling of 1612381 in words is "one million, six hundred twelve thousand, three hundred eighty-one".