400215024 has 120 divisors (see below), whose sum is σ = 1227338112. Its totient is φ = 120735360.

The previous prime is 400215017. The next prime is 400215047. The reversal of 400215024 is 420512004.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 400214988 and 400215006.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 485877 + ... + 486699.

Almost surely, 2^400215024 is an apocalyptic number.

400215024 is a gapful number since it is divisible by the number (44) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 400215024, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (613669056).

400215024 is an abundant number, since it is smaller than the sum of its proper divisors (827123088).

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

400215024 is a wasteful number, since it uses less digits than its factorization.

400215024 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1155 (or 1146 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

The square root of 400215024 is about 20005.3748777672. The cubic root of 400215024 is about 736.9383019427.

Adding to 400215024 its reverse (420512004), we get a palindrome (820727028).

The spelling of 400215024 in words is "four hundred million, two hundred fifteen thousand, twenty-four".