401786172 has 72 divisors (see below), whose sum is σ = 1067713920. Its totient is φ = 127147680.

The previous prime is 401786167. The next prime is 401786173. The reversal of 401786172 is 271687104.

401786172 is a `hidden beast` number, since 401 + 7 + 86 + 172 = 666.

It is a super-2 number, since 2×401786172² = 322864256020827168, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (401786173) 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, 113347 + ... + 116837.

It is an arithmetic number, because the mean of its divisors is an integer number (14829360).

Almost surely, 2^401786172 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 401786172, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (533856960).

401786172 is an abundant number, since it is smaller than the sum of its proper divisors (665927748).

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

401786172 is a wasteful number, since it uses less digits than its factorization.

401786172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3663 (or 3658 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 36.

The square root of 401786172 is about 20044.6045608288. The cubic root of 401786172 is about 737.9013903102.

The spelling of 401786172 in words is "four hundred one million, seven hundred eighty-six thousand, one hundred seventy-two".