400230640 has 20 divisors (see below), whose sum is σ = 930536424. Its totient is φ = 160092224.

The previous prime is 400230619. The next prime is 400230641. The reversal of 400230640 is 46032004.

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400230641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2501362 + ... + 2501521.

Almost surely, 2^400230640 is an apocalyptic number.

400230640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

400230640 is an abundant number, since it is smaller than the sum of its proper divisors (530305784).

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

400230640 is a wasteful number, since it uses less digits than its factorization.

400230640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5002896 (or 5002890 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 19.

The square root of 400230640 is about 20005.7651690706. The cubic root of 400230640 is about 736.9478866894.

Adding to 400230640 its reverse (46032004), we get a palindrome (446262644).

The spelling of 400230640 in words is "four hundred million, two hundred thirty thousand, six hundred forty".