400142550 has 72 divisors (see below), whose sum is σ = 1006013736. Its totient is φ = 105253760.

The previous prime is 400142467. The next prime is 400142573. The reversal of 400142550 is 55241004.

400142550 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×400142550² = 320228120641005000, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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, 1717234 + ... + 1717466.

It is an arithmetic number, because the mean of its divisors is an integer number (13972413).

Almost surely, 2^400142550 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 400142550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (503006868).

400142550 is an abundant number, since it is smaller than the sum of its proper divisors (605871186).

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

400142550 is a wasteful number, since it uses less digits than its factorization.

400142550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 462 (or 350 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 21.

The square root of 400142550 is about 20003.5634325487. The cubic root of 400142550 is about 736.8938157811.

Adding to 400142550 its reverse (55241004), we get a palindrome (455383554).

The spelling of 400142550 in words is "four hundred million, one hundred forty-two thousand, five hundred fifty".