400015240 has 32 divisors (see below), whose sum is σ = 920969280. Its totient is φ = 156284352.

The previous prime is 400015223. The next prime is 400015243. The reversal of 400015240 is 42510004.

It is not an unprimeable number, because it can be changed into a prime (400015243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 114564 + ... + 118003.

It is an arithmetic number, because the mean of its divisors is an integer number (28780290).

Almost surely, 2^400015240 is an apocalyptic number.

400015240 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

400015240 is an abundant number, since it is smaller than the sum of its proper divisors (520954040).

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

400015240 is a wasteful number, since it uses less digits than its factorization.

400015240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 232621 (or 232617 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 16.

The square root of 400015240 is about 20000.3809963710. The cubic root of 400015240 is about 736.8156570492.

Adding to 400015240 its reverse (42510004), we get a palindrome (442525244).

The spelling of 400015240 in words is "four hundred million, fifteen thousand, two hundred forty".