401207813 has 4 divisors (see below), whose sum is σ = 401602560. Its totient is φ = 400813068.

The previous prime is 401207809. The next prime is 401207843. The reversal of 401207813 is 318702104.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 401207813 - 2² = 401207809 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 (401207843) 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, 195845 + ... + 197882.

It is an arithmetic number, because the mean of its divisors is an integer number (100400640).

Almost surely, 2^401207813 is an apocalyptic number.

It is an amenable number.

401207813 is a deficient number, since it is larger than the sum of its proper divisors (394747).

401207813 is a wasteful number, since it uses less digits than its factorization.

401207813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 394746.

The product of its (nonzero) digits is 1344, while the sum is 26.

The square root of 401207813 is about 20030.1725654074. The cubic root of 401207813 is about 737.5471580685.

Adding to 401207813 its reverse (318702104), we get a palindrome (719909917).

The spelling of 401207813 in words is "four hundred one million, two hundred seven thousand, eight hundred thirteen".