401544215 has 4 divisors (see below), whose sum is σ = 481853064. Its totient is φ = 321235368.

The previous prime is 401544197. The next prime is 401544287. The reversal of 401544215 is 512445104.

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 401544215 - 2¹⁴ = 401527831 is a prime.

It is a super-2 number, since 2×401544215² = 322475513199932450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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, 40154417 + ... + 40154426.

It is an arithmetic number, because the mean of its divisors is an integer number (120463266).

Almost surely, 2^401544215 is an apocalyptic number.

401544215 is a deficient number, since it is larger than the sum of its proper divisors (80308849).

401544215 is an equidigital number, since it uses as much as digits as its factorization.

401544215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80308848.

The product of its (nonzero) digits is 3200, while the sum is 26.

The square root of 401544215 is about 20038.5681873731. The cubic root of 401544215 is about 737.7532383243.

Adding to 401544215 its reverse (512445104), we get a palindrome (913989319).

The spelling of 401544215 in words is "four hundred one million, five hundred forty-four thousand, two hundred fifteen".