1240401121 has 4 divisors (see below), whose sum is σ = 1243976112. Its totient is φ = 1236826132.

The previous prime is 1240401007. The next prime is 1240401131. The reversal of 1240401121 is 1211040421.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1211040421 = 269 ⋅4502009.

It is a cyclic number.

It is not a de Polignac number, because 1240401121 - 2¹³ = 1240392929 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1240401095 and 1240401104.

It is not an unprimeable number, because it can be changed into a prime (1240401131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1786975 + ... + 1787668.

It is an arithmetic number, because the mean of its divisors is an integer number (310994028).

Almost surely, 2^1240401121 is an apocalyptic number.

It is an amenable number.

1240401121 is a deficient number, since it is larger than the sum of its proper divisors (3574991).

1240401121 is an equidigital number, since it uses as much as digits as its factorization.

1240401121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3574990.

The product of its (nonzero) digits is 64, while the sum is 16.

The square root of 1240401121 is about 35219.3287982608. The cubic root of 1240401121 is about 1074.4529023603.

Adding to 1240401121 its reverse (1211040421), we get a palindrome (2451441542).

The spelling of 1240401121 in words is "one billion, two hundred forty million, four hundred one thousand, one hundred twenty-one".