2440400121 has 12 divisors (see below), whose sum is σ = 3526268772. Its totient is φ = 1626358176.

The previous prime is 2440400087. The next prime is 2440400153. The reversal of 2440400121 is 1210040442.

2440400121 is a `hidden beast` number, since 244 + 0 + 400 + 1 + 21 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1818596025 + 621804096 = 42645^2 + 24936^2 .

It is not a de Polignac number, because 2440400121 - 2⁶ = 2440400057 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2440400094 and 2440400103.

It is not an unprimeable number, because it can be changed into a prime (2440400021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20226 + ... + 72731.

It is an arithmetic number, because the mean of its divisors is an integer number (293855731).

Almost surely, 2^2440400121 is an apocalyptic number.

It is an amenable number.

2440400121 is a deficient number, since it is larger than the sum of its proper divisors (1085868651).

2440400121 is a wasteful number, since it uses less digits than its factorization.

2440400121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95880 (or 95877 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

The square root of 2440400121 is about 49400.4060813269. The cubic root of 2440400121 is about 1346.3366839744.

Adding to 2440400121 its reverse (1210040442), we get a palindrome (3650440563).

The spelling of 2440400121 in words is "two billion, four hundred forty million, four hundred thousand, one hundred twenty-one".