400071813 has 4 divisors (see below), whose sum is σ = 533429088. Its totient is φ = 266714540.

The previous prime is 400071781. The next prime is 400071851. The reversal of 400071813 is 318170004.

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 400071813 - 2⁵ = 400071781 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400071853) 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, 66678633 + ... + 66678638.

It is an arithmetic number, because the mean of its divisors is an integer number (133357272).

Almost surely, 2^400071813 is an apocalyptic number.

It is an amenable number.

400071813 is a deficient number, since it is larger than the sum of its proper divisors (133357275).

400071813 is a wasteful number, since it uses less digits than its factorization.

400071813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133357274.

The product of its (nonzero) digits is 672, while the sum is 24.

The square root of 400071813 is about 20001.7952444274. The cubic root of 400071813 is about 736.8503906486.

The spelling of 400071813 in words is "four hundred million, seventy-one thousand, eight hundred thirteen".