42823405 has 4 divisors (see below), whose sum is σ = 51388092. Its totient is φ = 34258720.

The previous prime is 42823387. The next prime is 42823409. The reversal of 42823405 is 50432824.

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 30228004 + 12595401 = 5498^2 + 3549^2 .

It is not a de Polignac number, because 42823405 - 2⁹ = 42822893 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 (42823409) 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, 4282336 + ... + 4282345.

It is an arithmetic number, because the mean of its divisors is an integer number (12847023).

Almost surely, 2^42823405 is an apocalyptic number.

It is an amenable number.

42823405 is a deficient number, since it is larger than the sum of its proper divisors (8564687).

42823405 is an equidigital number, since it uses as much as digits as its factorization.

42823405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8564686.

The product of its (nonzero) digits is 7680, while the sum is 28.

The square root of 42823405 is about 6543.9594283583. The cubic root of 42823405 is about 349.8595490884.

The spelling of 42823405 in words is "forty-two million, eight hundred twenty-three thousand, four hundred five".