1423981 has 4 divisors (see below), whose sum is σ = 1533532. Its totient is φ = 1314432.

The previous prime is 1423979. The next prime is 1423991. The reversal of 1423981 is 1893241.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1893241 = 7 ⋅270463.

It can be written as a sum of positive squares in 2 ways, for example, as 837225 + 586756 = 915^2 + 766^2 .

It is a cyclic number.

It is not a de Polignac number, because 1423981 - 2¹ = 1423979 is a prime.

It is a super-2 number, since 2×1423981² = 4055443776722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1423901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54756 + ... + 54781.

It is an arithmetic number, because the mean of its divisors is an integer number (383383).

2^1423981 is an apocalyptic number.

It is an amenable number.

1423981 is a deficient number, since it is larger than the sum of its proper divisors (109551).

1423981 is a wasteful number, since it uses less digits than its factorization.

1423981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109550.

The product of its digits is 1728, while the sum is 28.

The square root of 1423981 is about 1193.3067501695. The cubic root of 1423981 is about 112.5040261934.

The spelling of 1423981 in words is "one million, four hundred twenty-three thousand, nine hundred eighty-one".