400579997 has 4 divisors (see below), whose sum is σ = 402613596. Its totient is φ = 398546400.

The previous prime is 400579979. The next prime is 400579999. The reversal of 400579997 is 799975004.

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

It can be written as a sum of positive squares in 2 ways, for example, as 394459321 + 6120676 = 19861^2 + 2474^2 .

It is a cyclic number.

It is not a de Polignac number, because 400579997 - 2¹⁴ = 400563613 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 (400579999) 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, 1016504 + ... + 1016897.

It is an arithmetic number, because the mean of its divisors is an integer number (100653399).

Almost surely, 2^400579997 is an apocalyptic number.

It is an amenable number.

400579997 is a deficient number, since it is larger than the sum of its proper divisors (2033599).

400579997 is a wasteful number, since it uses less digits than its factorization.

400579997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2033598.

The product of its (nonzero) digits is 714420, while the sum is 50.

The square root of 400579997 is about 20014.4946726116. The cubic root of 400579997 is about 737.1622489451.

The spelling of 400579997 in words is "four hundred million, five hundred seventy-nine thousand, nine hundred ninety-seven".