401061780 has 144 divisors (see below), whose sum is σ = 1441964160. Its totient is φ = 91663488.

The previous prime is 401061779. The next prime is 401061797. The reversal of 401061780 is 87160104.

It is a happy number.

401061780 is a `hidden beast` number, since 40 + 1 + 0 + 617 + 8 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

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 47 ways as a sum of consecutive naturals, for example, 28126 + ... + 39914.

It is an arithmetic number, because the mean of its divisors is an integer number (10013640).

Almost surely, 2^401061780 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 401061780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (720982080).

401061780 is an abundant number, since it is smaller than the sum of its proper divisors (1040902380).

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

401061780 is a wasteful number, since it uses less digits than its factorization.

401061780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11820 (or 11806 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 27.

The square root of 401061780 is about 20026.5269080787. The cubic root of 401061780 is about 737.4576622253.

The spelling of 401061780 in words is "four hundred one million, sixty-one thousand, seven hundred eighty".