403943561 has 4 divisors (see below), whose sum is σ = 461649792. Its totient is φ = 346237332.

The previous prime is 403943543. The next prime is 403943563. The reversal of 403943561 is 165349304.

It is a happy number.

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 not a de Polignac number, because 403943561 - 2⁶ = 403943497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (403943563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28853105 + ... + 28853118.

It is an arithmetic number, because the mean of its divisors is an integer number (115412448).

Almost surely, 2^403943561 is an apocalyptic number.

It is an amenable number.

403943561 is a deficient number, since it is larger than the sum of its proper divisors (57706231).

403943561 is an equidigital number, since it uses as much as digits as its factorization.

403943561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57706230.

The product of its (nonzero) digits is 38880, while the sum is 35.

The square root of 403943561 is about 20098.3472206050. The cubic root of 403943561 is about 739.2197528433.

The spelling of 403943561 in words is "four hundred three million, nine hundred forty-three thousand, five hundred sixty-one".