400722881 has 16 divisors (see below), whose sum is σ = 435795024. Its totient is φ = 366280704.

The previous prime is 400722869. The next prime is 400722911. The reversal of 400722881 is 188227004.

It can be written as a sum of positive squares in 8 ways, for example, as 27615025 + 373107856 = 5255^2 + 19316^2 .

It is a cyclic number.

It is not a de Polignac number, because 400722881 - 2²² = 396528577 is a prime.

It is a super-2 number, since 2×400722881² = 321157654713880322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (400722821) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 925241 + ... + 925673.

It is an arithmetic number, because the mean of its divisors is an integer number (27237189).

Almost surely, 2^400722881 is an apocalyptic number.

It is an amenable number.

400722881 is a deficient number, since it is larger than the sum of its proper divisors (35072143).

400722881 is a wasteful number, since it uses less digits than its factorization.

400722881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 980.

The product of its (nonzero) digits is 7168, while the sum is 32.

The square root of 400722881 is about 20018.0638674173. The cubic root of 400722881 is about 737.2498853479.

Adding to 400722881 its reverse (188227004), we get a palindrome (588949885).

The spelling of 400722881 in words is "four hundred million, seven hundred twenty-two thousand, eight hundred eighty-one".