400415780 has 24 divisors (see below), whose sum is σ = 841739640. Its totient is φ = 160001280.

The previous prime is 400415767. The next prime is 400415797. The reversal of 400415780 is 87514004.

It can be written as a sum of positive squares in 4 ways, for example, as 179774464 + 220641316 = 13408^2 + 14854^2 .

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 10616 + ... + 30224.

It is an arithmetic number, because the mean of its divisors is an integer number (35072485).

Almost surely, 2^400415780 is an apocalyptic number.

It is an amenable number.

400415780 is an abundant number, since it is smaller than the sum of its proper divisors (441323860).

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

400415780 is a wasteful number, since it uses less digits than its factorization.

400415780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20639 (or 20637 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 29.

The square root of 400415780 is about 20010.3918002622. The cubic root of 400415780 is about 737.0615024278.

Adding to 400415780 its reverse (87514004), we get a palindrome (487929784).

The spelling of 400415780 in words is "four hundred million, four hundred fifteen thousand, seven hundred eighty".