400145550 has 96 divisors (see below), whose sum is σ = 1140998400. Its totient is φ = 90908160.

The previous prime is 400145539. The next prime is 400145587. The reversal of 400145550 is 55541004.

It is a super-2 number, since 2×400145550² = 320232922369605000, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 400145550.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 186886 + ... + 189014.

It is an arithmetic number, because the mean of its divisors is an integer number (11885400).

Almost surely, 2^400145550 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 400145550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (570499200).

400145550 is an abundant number, since it is smaller than the sum of its proper divisors (740852850).

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

400145550 is a wasteful number, since it uses less digits than its factorization.

400145550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2330 (or 2325 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 24.

The square root of 400145550 is about 20003.6384190477. The cubic root of 400145550 is about 736.8956573547.

Adding to 400145550 its reverse (55541004), we get a palindrome (455686554).

The spelling of 400145550 in words is "four hundred million, one hundred forty-five thousand, five hundred fifty".