400242580 has 24 divisors (see below), whose sum is σ = 841696128. Its totient is φ = 159871008.

The previous prime is 400242559. The next prime is 400242587. The reversal of 400242580 is 85242004.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400242587) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 777 + ... + 28303.

It is an arithmetic number, because the mean of its divisors is an integer number (35070672).

Almost surely, 2^400242580 is an apocalyptic number.

It is an amenable number.

400242580 is an abundant number, since it is smaller than the sum of its proper divisors (441453548).

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

400242580 is a wasteful number, since it uses less digits than its factorization.

400242580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28263 (or 28261 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 25.

The square root of 400242580 is about 20006.0635808247. The cubic root of 400242580 is about 736.9552150224.

Adding to 400242580 its reverse (85242004), we get a palindrome (485484584).

The spelling of 400242580 in words is "four hundred million, two hundred forty-two thousand, five hundred eighty".