400081573 has 4 divisors (see below), whose sum is σ = 417476448. Its totient is φ = 382686700.

The previous prime is 400081571. The next prime is 400081603. The reversal of 400081573 is 375180004.

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 400081573 - 2¹ = 400081571 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 (400081571) 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, 8697403 + ... + 8697448.

It is an arithmetic number, because the mean of its divisors is an integer number (104369112).

Almost surely, 2^400081573 is an apocalyptic number.

It is an amenable number.

400081573 is a deficient number, since it is larger than the sum of its proper divisors (17394875).

400081573 is a wasteful number, since it uses less digits than its factorization.

400081573 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17394874.

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 400081573 is about 20002.0392210394. The cubic root of 400081573 is about 736.8563825740.

The spelling of 400081573 in words is "four hundred million, eighty-one thousand, five hundred seventy-three".