1421981 has 8 divisors (see below), whose sum is σ = 1560384. Its totient is φ = 1285120.

The previous prime is 1421977. The next prime is 1421989. The reversal of 1421981 is 1891241.

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

It is a cyclic number.

It is not a de Polignac number, because 1421981 - 2² = 1421977 is a prime.

It is a super-2 number, since 2×1421981² = 4044059928722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1421981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1421989) 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, 2576 + ... + 3078.

It is an arithmetic number, because the mean of its divisors is an integer number (195048).

2^1421981 is an apocalyptic number.

1421981 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1421981 is a deficient number, since it is larger than the sum of its proper divisors (138403).

1421981 is a wasteful number, since it uses less digits than its factorization.

1421981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 771.

The product of its digits is 576, while the sum is 26.

The square root of 1421981 is about 1192.4684482199. The cubic root of 1421981 is about 112.4513303880.

The spelling of 1421981 in words is "one million, four hundred twenty-one thousand, nine hundred eighty-one".