2400403 has 4 divisors (see below), whose sum is σ = 2526760. Its totient is φ = 2274048.

The previous prime is 2400367. The next prime is 2400407. The reversal of 2400403 is 3040042.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2400403 - 2¹⁷ = 2269331 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2400407) 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, 63150 + ... + 63187.

It is an arithmetic number, because the mean of its divisors is an integer number (631690).

2^2400403 is an apocalyptic number.

2400403 is a deficient number, since it is larger than the sum of its proper divisors (126357).

2400403 is a wasteful number, since it uses less digits than its factorization.

2400403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126356.

The product of its (nonzero) digits is 96, while the sum is 13.

The square root of 2400403 is about 1549.3234007140. The cubic root of 2400403 is about 133.8940835270.

Adding to 2400403 its reverse (3040042), we get a palindrome (5440445).

The spelling of 2400403 in words is "two million, four hundred thousand, four hundred three".