400997593 has 4 divisors (see below), whose sum is σ = 404676580. Its totient is φ = 397318608.

The previous prime is 400997557. The next prime is 400997609. The reversal of 400997593 is 395799004.

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 343435024 + 57562569 = 18532^2 + 7587^2 .

It is a cyclic number.

It is not a de Polignac number, because 400997593 - 2⁹ = 400997081 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (400997503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1839330 + ... + 1839547.

It is an arithmetic number, because the mean of its divisors is an integer number (101169145).

Almost surely, 2^400997593 is an apocalyptic number.

It is an amenable number.

400997593 is a deficient number, since it is larger than the sum of its proper divisors (3678987).

400997593 is a wasteful number, since it uses less digits than its factorization.

400997593 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3678986.

The product of its (nonzero) digits is 306180, while the sum is 46.

The square root of 400997593 is about 20024.9242944886. The cubic root of 400997593 is about 737.4183185608.

The spelling of 400997593 in words is "four hundred million, nine hundred ninety-seven thousand, five hundred ninety-three".