400512415 has 4 divisors (see below), whose sum is σ = 480614904. Its totient is φ = 320409928.

The previous prime is 400512403. The next prime is 400512461. The reversal of 400512415 is 514215004.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-400512415 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40051237 + ... + 40051246.

It is an arithmetic number, because the mean of its divisors is an integer number (120153726).

Almost surely, 2^400512415 is an apocalyptic number.

400512415 is a deficient number, since it is larger than the sum of its proper divisors (80102489).

400512415 is an equidigital number, since it uses as much as digits as its factorization.

400512415 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80102488.

The product of its (nonzero) digits is 800, while the sum is 22.

The square root of 400512415 is about 20012.8062749830. The cubic root of 400512415 is about 737.1207909747.

Adding to 400512415 its reverse (514215004), we get a palindrome (914727419).

The spelling of 400512415 in words is "four hundred million, five hundred twelve thousand, four hundred fifteen".