1243023523 has 48 divisors (see below), whose sum is σ = 1592745984. Its totient is φ = 963990720.

The previous prime is 1243023427. The next prime is 1243023553. The reversal of 1243023523 is 3253203421.

It is not a de Polignac number, because 1243023523 - 2⁹ = 1243023011 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1243023553) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1641661 + ... + 1642417.

It is an arithmetic number, because the mean of its divisors is an integer number (33182208).

Almost surely, 2^1243023523 is an apocalyptic number.

1243023523 is a deficient number, since it is larger than the sum of its proper divisors (349722461).

1243023523 is a wasteful number, since it uses less digits than its factorization.

1243023523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 872 (or 865 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 25.

The square root of 1243023523 is about 35256.5387268802. The cubic root of 1243023523 is about 1075.2095565512.

Adding to 1243023523 its reverse (3253203421), we get a palindrome (4496226944).

It can be divided in two parts, 12430 and 23523, that added together give a palindrome (35953).

The spelling of 1243023523 in words is "one billion, two hundred forty-three million, twenty-three thousand, five hundred twenty-three".