401021115 has 32 divisors (see below), whose sum is σ = 722552832. Its totient is φ = 188160000.

The previous prime is 401021113. The next prime is 401021141. The reversal of 401021115 is 511120104.

It is a happy number.

It is not a de Polignac number, because 401021115 - 2¹ = 401021113 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 = 401021094 and 401021103.

It is not an unprimeable number, because it can be changed into a prime (401021111) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 34086 + ... + 44315.

It is an arithmetic number, because the mean of its divisors is an integer number (22579776).

Almost surely, 2^401021115 is an apocalyptic number.

401021115 is a deficient number, since it is larger than the sum of its proper divisors (321531717).

401021115 is a wasteful number, since it uses less digits than its factorization.

401021115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78451.

The product of its (nonzero) digits is 40, while the sum is 15.

The square root of 401021115 is about 20025.5116039516. The cubic root of 401021115 is about 737.4327369470.

Adding to 401021115 its reverse (511120104), we get a palindrome (912141219).

The spelling of 401021115 in words is "four hundred one million, twenty-one thousand, one hundred fifteen".