400345415 has 4 divisors (see below), whose sum is σ = 480414504. Its totient is φ = 320276328.

The previous prime is 400345367. The next prime is 400345417. The reversal of 400345415 is 514543004.

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

It is a cyclic number.

It is not a de Polignac number, because 400345415 - 2²² = 396151111 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400345417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40034537 + ... + 40034546.

It is an arithmetic number, because the mean of its divisors is an integer number (120103626).

Almost surely, 2^400345415 is an apocalyptic number.

400345415 is a deficient number, since it is larger than the sum of its proper divisors (80069089).

400345415 is an equidigital number, since it uses as much as digits as its factorization.

400345415 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80069088.

The product of its (nonzero) digits is 4800, while the sum is 26.

The square root of 400345415 is about 20008.6335115620. The cubic root of 400345415 is about 737.0183253324.

Adding to 400345415 its reverse (514543004), we get a palindrome (914888419).

The spelling of 400345415 in words is "four hundred million, three hundred forty-five thousand, four hundred fifteen".