1423661 has 4 divisors (see below), whose sum is σ = 1426524. Its totient is φ = 1420800.

The previous prime is 1423637. The next prime is 1423663. The reversal of 1423661 is 1663241.

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: 1663241 = 19 ⋅87539.

It can be written as a sum of positive squares in 2 ways, for example, as 1142761 + 280900 = 1069^2 + 530^2 .

It is a cyclic number.

It is not a de Polignac number, because 1423661 - 2¹⁰ = 1422637 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1423663) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 470 + ... + 1751.

It is an arithmetic number, because the mean of its divisors is an integer number (356631).

2^1423661 is an apocalyptic number.

It is an amenable number.

1423661 is a deficient number, since it is larger than the sum of its proper divisors (2863).

1423661 is an equidigital number, since it uses as much as digits as its factorization.

1423661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2862.

The product of its digits is 864, while the sum is 23.

The square root of 1423661 is about 1193.1726614367. The cubic root of 1423661 is about 112.4955981817.

The spelling of 1423661 in words is "one million, four hundred twenty-three thousand, six hundred sixty-one".