400120 has 32 divisors (see below), whose sum is σ = 1029600. Its totient is φ = 137088.

The previous prime is 400109. The next prime is 400123. The reversal of 400120 is 21004.

It is a Harshad number since it is a multiple of its sum of digits (7).

400120 is a modest number, since divided by 120 gives 40 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400123) 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, 435 + ... + 994.

It is an arithmetic number, because the mean of its divisors is an integer number (32175).

2⁴⁰⁰¹²⁰ is an apocalyptic number.

400120 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

400120 is an abundant number, since it is smaller than the sum of its proper divisors (629480).

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

400120 is a wasteful number, since it uses less digits than its factorization.

400120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1447 (or 1443 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 7.

The square root of 400120 is about 632.5503932494. The cubic root of 400120 is about 73.6879972991.

Adding to 400120 its reverse (21004), we get a palindrome (421124).

The spelling of 400120 in words is "four hundred thousand, one hundred twenty", and thus it is an iban number.