400121358 has 72 divisors (see below), whose sum is σ = 1008135288. Its totient is φ = 105513408.

The previous prime is 400121353. The next prime is 400121377. The reversal of 400121358 is 853121004.

It is a super-2 number, since 2×400121358² = 320194202255528328, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400121353) 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 35 ways as a sum of consecutive naturals, for example, 45660 + ... + 53712.

It is an arithmetic number, because the mean of its divisors is an integer number (14001879).

Almost surely, 2^400121358 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 400121358, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (504067644).

400121358 is an abundant number, since it is smaller than the sum of its proper divisors (608013930).

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

400121358 is a wasteful number, since it uses less digits than its factorization.

400121358 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8098 (or 8078 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 400121358 is about 20003.0337199136. The cubic root of 400121358 is about 736.8808066427.

The spelling of 400121358 in words is "four hundred million, one hundred twenty-one thousand, three hundred fifty-eight".