400115 has 8 divisors (see below), whose sum is σ = 491568. Its totient is φ = 312480.

The previous prime is 400109. The next prime is 400123. The reversal of 400115 is 511004.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 400115 - 2⁶ = 400051 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 400096 and 400105.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 716 + ... + 1145.

It is an arithmetic number, because the mean of its divisors is an integer number (61446).

2⁴⁰⁰¹¹⁵ is an apocalyptic number.

400115 is a deficient number, since it is larger than the sum of its proper divisors (91453).

400115 is a wasteful number, since it uses less digits than its factorization.

400115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1909.

The product of its (nonzero) digits is 20, while the sum is 11.

The square root of 400115 is about 632.5464409828. The cubic root of 400115 is about 73.6876903566.

Adding to 400115 its reverse (511004), we get a palindrome (911119).

Subtracting 400115 from its reverse (511004), we obtain a square (110889 = 333²).

It can be divided in two parts, 400 and 115, that added together give a palindrome (515).

The spelling of 400115 in words is "four hundred thousand, one hundred fifteen".