1242320405 has 16 divisors (see below), whose sum is σ = 1498595904. Its totient is φ = 988665600.

The previous prime is 1242320383. The next prime is 1242320411. The reversal of 1242320405 is 5040232421.

It is a happy number.

It is not a de Polignac number, because 1242320405 - 2⁶ = 1242320341 is a prime.

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 15 ways as a sum of consecutive naturals, for example, 1033805 + ... + 1035005.

It is an arithmetic number, because the mean of its divisors is an integer number (93662244).

Almost surely, 2^1242320405 is an apocalyptic number.

It is an amenable number.

1242320405 is a deficient number, since it is larger than the sum of its proper divisors (256275499).

1242320405 is a wasteful number, since it uses less digits than its factorization.

1242320405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2116.

The product of its (nonzero) digits is 1920, while the sum is 23.

The square root of 1242320405 is about 35246.5658610878. The cubic root of 1242320405 is about 1075.0067870493.

Adding to 1242320405 its reverse (5040232421), we get a palindrome (6282552826).

The spelling of 1242320405 in words is "one billion, two hundred forty-two million, three hundred twenty thousand, four hundred five".