1243240401 has 16 divisors (see below), whose sum is σ = 1790997824. Its totient is φ = 762571584.

The previous prime is 1243240393. The next prime is 1243240421. The reversal of 1243240401 is 1040423421.

It is not a de Polignac number, because 1243240401 - 2³ = 1243240393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1243240421) 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, 39946 + ... + 63891.

It is an arithmetic number, because the mean of its divisors is an integer number (111937364).

Almost surely, 2^1243240401 is an apocalyptic number.

It is an amenable number.

1243240401 is a deficient number, since it is larger than the sum of its proper divisors (547757423).

1243240401 is a wasteful number, since it uses less digits than its factorization.

1243240401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104160.

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 1243240401 is about 35259.6143058883. The cubic root of 1243240401 is about 1075.2720857346.

Adding to 1243240401 its reverse (1040423421), we get a palindrome (2283663822).

The spelling of 1243240401 in words is "one billion, two hundred forty-three million, two hundred forty thousand, four hundred one".