400215240 has 96 divisors (see below), whose sum is σ = 1369180800. Its totient is φ = 101105280.

The previous prime is 400215229. The next prime is 400215251. The reversal of 400215240 is 42512004.

400215240 is a `hidden beast` number, since 400 + 21 + 5 + 240 = 666.

It is an interprime number because it is at equal distance from previous prime (400215229) and next prime (400215251).

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

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, 22416 + ... + 36095.

It is an arithmetic number, because the mean of its divisors is an integer number (14262300).

Almost surely, 2^400215240 is an apocalyptic number.

400215240 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

400215240 is an abundant number, since it is smaller than the sum of its proper divisors (968965560).

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

400215240 is a wasteful number, since it uses less digits than its factorization.

400215240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58547 (or 58540 counting only the distinct ones).

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

The square root of 400215240 is about 20005.3802763157. The cubic root of 400215240 is about 736.9384345203.

Adding to 400215240 its reverse (42512004), we get a palindrome (442727244).

The spelling of 400215240 in words is "four hundred million, two hundred fifteen thousand, two hundred forty".