400231040 has 128 divisors (see below), whose sum is σ = 1053864000. Its totient is φ = 144138240.

The previous prime is 400231019. The next prime is 400231093. The reversal of 400231040 is 40132004.

It is a tau number, because it is divible by the number of its divisors (128).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 978356 + ... + 978764.

Almost surely, 2^400231040 is an apocalyptic number.

400231040 is a gapful number since it is divisible by the number (40) 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 400231040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (526932000).

400231040 is an abundant number, since it is smaller than the sum of its proper divisors (653632960).

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

400231040 is a wasteful number, since it uses less digits than its factorization.

400231040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 578 (or 566 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 14.

The square root of 400231040 is about 20005.7751661864. The cubic root of 400231040 is about 736.9481321970.

Adding to 400231040 its reverse (40132004), we get a palindrome (440363044).

The spelling of 400231040 in words is "four hundred million, two hundred thirty-one thousand, forty".