2400400405 has 16 divisors (see below), whose sum is σ = 3236929920. Its totient is φ = 1695532608.

The previous prime is 2400400393. The next prime is 2400400411. The reversal of 2400400405 is 5040040042.

It is a cyclic number.

It is not a de Polignac number, because 2400400405 - 2⁹ = 2400399893 is a prime.

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, 801315 + ... + 804304.

It is an arithmetic number, because the mean of its divisors is an integer number (202308120).

Almost surely, 2^2400400405 is an apocalyptic number.

It is an amenable number.

2400400405 is a deficient number, since it is larger than the sum of its proper divisors (836529515).

2400400405 is a wasteful number, since it uses less digits than its factorization.

2400400405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1605660.

The product of its (nonzero) digits is 640, while the sum is 19.

The square root of 2400400405 is about 48993.8813016483. The cubic root of 2400400405 is about 1338.9403527742.

Adding to 2400400405 its reverse (5040040042), we get a palindrome (7440440447).

The spelling of 2400400405 in words is "two billion, four hundred million, four hundred thousand, four hundred five".