1916381 has 8 divisors (see below), whose sum is σ = 2010624. Its totient is φ = 1824480.

The previous prime is 1916371. The next prime is 1916413. The reversal of 1916381 is 1836191.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1916381 is a prime.

It is a super-2 number, since 2×1916381² = 7345032274322, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1916311) 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, 1220 + ... + 2306.

It is an arithmetic number, because the mean of its divisors is an integer number (251328).

2^1916381 is an apocalyptic number.

It is an amenable number.

1916381 is a deficient number, since it is larger than the sum of its proper divisors (94243).

1916381 is a wasteful number, since it uses less digits than its factorization.

1916381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1171.

The product of its digits is 1296, while the sum is 29.

The square root of 1916381 is about 1384.3341359657. The cubic root of 1916381 is about 124.2111603277.

The spelling of 1916381 in words is "one million, nine hundred sixteen thousand, three hundred eighty-one".