400550172 has 72 divisors (see below), whose sum is σ = 1081449600. Its totient is φ = 114982560.

The previous prime is 400550119. The next prime is 400550201. The reversal of 400550172 is 271055004.

It is a super-3 number, since 3×400550172³ (a number of 27 digits) contains 333 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 (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20329 + ... + 34847.

Almost surely, 2^400550172 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 400550172, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (540724800).

400550172 is an abundant number, since it is smaller than the sum of its proper divisors (680899428).

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

400550172 is a wasteful number, since it uses less digits than its factorization.

400550172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14567 (or 14554 counting only the distinct ones).

The product of its (nonzero) digits is 1400, while the sum is 24.

The square root of 400550172 is about 20013.7495737306. The cubic root of 400550172 is about 737.1439534653.

The spelling of 400550172 in words is "four hundred million, five hundred fifty thousand, one hundred seventy-two".