1440023 has 4 divisors (see below), whose sum is σ = 1550808. Its totient is φ = 1329240.

The previous prime is 1440017. The next prime is 1440037. The reversal of 1440023 is 3200441.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3200441 = 1481 ⋅2161.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1440023 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1440623) 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, 55373 + ... + 55398.

It is an arithmetic number, because the mean of its divisors is an integer number (387702).

2^1440023 is an apocalyptic number.

1440023 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1440023 is a deficient number, since it is larger than the sum of its proper divisors (110785).

1440023 is a wasteful number, since it uses less digits than its factorization.

1440023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110784.

The product of its (nonzero) digits is 96, while the sum is 14.

The square root of 1440023 is about 1200.0095832951. The cubic root of 1440023 is about 112.9249246800.

Adding to 1440023 its reverse (3200441), we get a palindrome (4640464).

The spelling of 1440023 in words is "one million, four hundred forty thousand, twenty-three".