420000731 has 4 divisors (see below), whose sum is σ = 424078512. Its totient is φ = 415922952.

The previous prime is 420000703. The next prime is 420000733. The reversal of 420000731 is 137000024.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 420000731 - 2¹⁰ = 419999707 is a prime.

It is a super-2 number, since 2×420000731² = 352801228081068722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (420000733) 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, 2038736 + ... + 2038941.

It is an arithmetic number, because the mean of its divisors is an integer number (106019628).

Almost surely, 2^420000731 is an apocalyptic number.

420000731 is a deficient number, since it is larger than the sum of its proper divisors (4077781).

420000731 is a wasteful number, since it uses less digits than its factorization.

420000731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4077780.

The product of its (nonzero) digits is 168, while the sum is 17.

The square root of 420000731 is about 20493.9193664853. The cubic root of 420000731 is about 748.8876731951.

Adding to 420000731 its reverse (137000024), we get a palindrome (557000755).

The spelling of 420000731 in words is "four hundred twenty million, seven hundred thirty-one", and thus it is an aban number.