1243426923 has 16 divisors (see below), whose sum is σ = 1844038560. Its totient is φ = 828085248.

The previous prime is 1243426913. The next prime is 1243426963. The reversal of 1243426923 is 3296243421.

It is not a de Polignac number, because 1243426923 - 2⁴ = 1243426907 is a prime.

It is a super-2 number, since 2×1243426923² = 3092221025682495858, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1243426913) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2811 + ... + 49947.

It is an arithmetic number, because the mean of its divisors is an integer number (115252410).

Almost surely, 2^1243426923 is an apocalyptic number.

1243426923 is a deficient number, since it is larger than the sum of its proper divisors (600611637).

1243426923 is an equidigital number, since it uses as much as digits as its factorization.

1243426923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48123 (or 48117 counting only the distinct ones).

The product of its digits is 62208, while the sum is 36.

The square root of 1243426923 is about 35262.2591874089. The cubic root of 1243426923 is about 1075.3258570113.

The spelling of 1243426923 in words is "one billion, two hundred forty-three million, four hundred twenty-six thousand, nine hundred twenty-three".