403940265 has 16 divisors (see below), whose sum is σ = 646800000. Its totient is φ = 215269632.

The previous prime is 403940239. The next prime is 403940267. The reversal of 403940265 is 562049304.

It is not a de Polignac number, because 403940265 - 2¹¹ = 403938217 is a prime.

It is not an unprimeable number, because it can be changed into a prime (403940267) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11361 + ... + 30609.

It is an arithmetic number, because the mean of its divisors is an integer number (40425000).

Almost surely, 2^403940265 is an apocalyptic number.

It is an amenable number.

403940265 is a deficient number, since it is larger than the sum of its proper divisors (242859735).

403940265 is a wasteful number, since it uses less digits than its factorization.

403940265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20656.

The product of its (nonzero) digits is 25920, while the sum is 33.

The square root of 403940265 is about 20098.2652236455. The cubic root of 403940265 is about 739.2177422695.

Adding to 403940265 its reverse (562049304), we get a palindrome (965989569).

The spelling of 403940265 in words is "four hundred three million, nine hundred forty thousand, two hundred sixty-five".