400120215 has 16 divisors (see below), whose sum is σ = 698391936. Its totient is φ = 193997600.

The previous prime is 400120207. The next prime is 400120223. The reversal of 400120215 is 512021004.

It is an interprime number because it is at equal distance from previous prime (400120207) and next prime (400120223).

It is not a de Polignac number, because 400120215 - 2³ = 400120207 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a junction number, because it is equal to n+sod(n) for n = 400120194 and 400120203.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1212321 + ... + 1212650.

It is an arithmetic number, because the mean of its divisors is an integer number (43649496).

Almost surely, 2^400120215 is an apocalyptic number.

400120215 is a deficient number, since it is larger than the sum of its proper divisors (298271721).

400120215 is a wasteful number, since it uses less digits than its factorization.

400120215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2424990.

The product of its (nonzero) digits is 80, while the sum is 15.

The square root of 400120215 is about 20003.0051492270. The cubic root of 400120215 is about 736.8801049759.

Adding to 400120215 its reverse (512021004), we get a palindrome (912141219).

The spelling of 400120215 in words is "four hundred million, one hundred twenty thousand, two hundred fifteen".