400601580 has 96 divisors (see below), whose sum is σ = 1181827584. Its totient is φ = 101190144.

The previous prime is 400601569. The next prime is 400601581. The reversal of 400601580 is 85106004.

It is a self number, because there is not a number n which added to its sum of digits gives 400601580.

It is not an unprimeable number, because it can be changed into a prime (400601581) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 146304 + ... + 149016.

It is an arithmetic number, because the mean of its divisors is an integer number (12310704).

Almost surely, 2^400601580 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 400601580, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (590913792).

400601580 is an abundant number, since it is smaller than the sum of its proper divisors (781226004).

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

400601580 is a wasteful number, since it uses less digits than its factorization.

400601580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2855 (or 2853 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 400601580 is about 20015.0338495842. The cubic root of 400601580 is about 737.1754879878.

Adding to 400601580 its reverse (85106004), we get a palindrome (485707584).

The spelling of 400601580 in words is "four hundred million, six hundred one thousand, five hundred eighty".