400621100 has 72 divisors (see below), whose sum is σ = 952814016. Its totient is φ = 145000000.

The previous prime is 400621097. The next prime is 400621103. The reversal of 400621100 is 1126004.

It is an interprime number because it is at equal distance from previous prime (400621097) and next prime (400621103).

It is not an unprimeable number, because it can be changed into a prime (400621103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 275375 + ... + 276825.

It is an arithmetic number, because the mean of its divisors is an integer number (13233528).

Almost surely, 2^400621100 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 400621100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (476407008).

400621100 is an abundant number, since it is smaller than the sum of its proper divisors (552192916).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

400621100 is a wasteful number, since it uses less digits than its factorization.

400621100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1727 (or 1720 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 400621100 is about 20015.5214770937. The cubic root of 400621100 is about 737.1874611739.

Adding to 400621100 its reverse (1126004), we get a palindrome (401747104).

The spelling of 400621100 in words is "four hundred million, six hundred twenty-one thousand, one hundred".