1916981 has 8 divisors (see below), whose sum is σ = 2182464. Its totient is φ = 1666720.

The previous prime is 1916977. The next prime is 1917001. The reversal of 1916981 is 1896191.

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

It is not a de Polignac number, because 1916981 - 2² = 1916977 is a prime.

It is a super-2 number, since 2×1916981² = 7349632308722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1916921) 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, 3536 + ... + 4041.

It is an arithmetic number, because the mean of its divisors is an integer number (272808).

2^1916981 is an apocalyptic number.

1916981 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1916981 is a deficient number, since it is larger than the sum of its proper divisors (265483).

1916981 is a wasteful number, since it uses less digits than its factorization.

1916981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7611.

The product of its digits is 3888, while the sum is 35.

The square root of 1916981 is about 1384.5508296917. The cubic root of 1916981 is about 124.2241220716.

The spelling of 1916981 in words is "one million, nine hundred sixteen thousand, nine hundred eighty-one".