400128826 has 8 divisors (see below), whose sum is σ = 602330004. Its totient is φ = 199352160.

The previous prime is 400128793. The next prime is 400128857. The reversal of 400128826 is 628821004.

It can be written as a sum of positive squares in 2 ways, for example, as 378497025 + 21631801 = 19455^2 + 4651^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×400128826² = 320206154792276552, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 355425 + ... + 356548.

Almost surely, 2^400128826 is an apocalyptic number.

400128826 is a deficient number, since it is larger than the sum of its proper divisors (202201178).

400128826 is a wasteful number, since it uses less digits than its factorization.

400128826 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 712256.

The product of its (nonzero) digits is 6144, while the sum is 31.

The square root of 400128826 is about 20003.2203907271. The cubic root of 400128826 is about 736.8853910781.

The spelling of 400128826 in words is "four hundred million, one hundred twenty-eight thousand, eight hundred twenty-six".