400720265 has 32 divisors (see below), whose sum is σ = 544102272. Its totient is φ = 280768000.

The previous prime is 400720259. The next prime is 400720267. The reversal of 400720265 is 562027004.

It is not a de Polignac number, because 400720265 - 2¹⁴ = 400703881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (400720267) 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 31 ways as a sum of consecutive naturals, for example, 186095 + ... + 188235.

It is an arithmetic number, because the mean of its divisors is an integer number (17003196).

Almost surely, 2^400720265 is an apocalyptic number.

It is an amenable number.

400720265 is a deficient number, since it is larger than the sum of its proper divisors (143382007).

400720265 is a wasteful number, since it uses less digits than its factorization.

400720265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2281.

The product of its (nonzero) digits is 3360, while the sum is 26.

The square root of 400720265 is about 20017.9985263263. The cubic root of 400720265 is about 737.2482810390.

Adding to 400720265 its reverse (562027004), we get a palindrome (962747269).

The spelling of 400720265 in words is "four hundred million, seven hundred twenty thousand, two hundred sixty-five".