1247623 has 4 divisors (see below), whose sum is σ = 1343608. Its totient is φ = 1151640.

The previous prime is 1247621. The next prime is 1247627. The reversal of 1247623 is 3267421.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3267421 = 149 ⋅21929.

It is a cyclic number.

It is not a de Polignac number, because 1247623 - 2¹ = 1247621 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 (1247621) 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, 47973 + ... + 47998.

It is an arithmetic number, because the mean of its divisors is an integer number (335902).

2^1247623 is an apocalyptic number.

1247623 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1247623 is a deficient number, since it is larger than the sum of its proper divisors (95985).

1247623 is an equidigital number, since it uses as much as digits as its factorization.

1247623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95984.

The product of its digits is 2016, while the sum is 25.

The square root of 1247623 is about 1116.9704561894. The cubic root of 1247623 is about 107.6534099578.

It can be divided in two parts, 1247 and 623, that multiplied together give a triangular number (776881 = T₁₂₄₆).

The spelling of 1247623 in words is "one million, two hundred forty-seven thousand, six hundred twenty-three".