1242023005 has 4 divisors (see below), whose sum is σ = 1490427612. Its totient is φ = 993618400.

The previous prime is 1242022997. The next prime is 1242023021. The reversal of 1242023005 is 5003202421.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 666310969 + 575712036 = 25813^2 + 23994^2 .

It is not a de Polignac number, because 1242023005 - 2³ = 1242022997 is a prime.

It is a super-2 number, since 2×1242023005² = 3085242289898460050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 124202296 + ... + 124202305.

It is an arithmetic number, because the mean of its divisors is an integer number (372606903).

Almost surely, 2^1242023005 is an apocalyptic number.

It is an amenable number.

1242023005 is a deficient number, since it is larger than the sum of its proper divisors (248404607).

1242023005 is an equidigital number, since it uses as much as digits as its factorization.

1242023005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 248404606.

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 1242023005 is about 35242.3467578423. The cubic root of 1242023005 is about 1074.9209979801.

Adding to 1242023005 its reverse (5003202421), we get a palindrome (6245225426).

The spelling of 1242023005 in words is "one billion, two hundred forty-two million, twenty-three thousand, five".