400001120 has 48 divisors (see below), whose sum is σ = 961042320. Its totient is φ = 157284864.

The previous prime is 400001113. The next prime is 400001137. The reversal of 400001120 is 21100004.

It is a Harshad number since it is a multiple of its sum of digits (8).

It is a junction number, because it is equal to n+sod(n) for n = 400001098 and 400001107.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11747 + ... + 30626.

It is an arithmetic number, because the mean of its divisors is an integer number (20021715).

Almost surely, 2^400001120 is an apocalyptic number.

400001120 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

400001120 is an abundant number, since it is smaller than the sum of its proper divisors (561041200).

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

400001120 is a wasteful number, since it uses less digits than its factorization.

400001120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42447 (or 42439 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 8.

The square root of 400001120 is about 20000.0279999804. The cubic root of 400001120 is about 736.8069874133.

Adding to 400001120 its reverse (21100004), we get a palindrome (421101124).

The spelling of 400001120 in words is "four hundred million, one thousand, one hundred twenty".