406820731 has 4 divisors (see below), whose sum is σ = 406861272. Its totient is φ = 406780192.

The previous prime is 406820677. The next prime is 406820747. The reversal of 406820731 is 137028604.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 406820731 - 2¹⁵ = 406787963 is a prime.

It is a super-2 number, since 2×406820731² = 331006214342748722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 406820693 and 406820702.

It is not an unprimeable number, because it can be changed into a prime (406820431) 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, 7116 + ... + 29398.

It is an arithmetic number, because the mean of its divisors is an integer number (101715318).

Almost surely, 2^406820731 is an apocalyptic number.

406820731 is the 12757-th centered pentagonal number.

406820731 is a deficient number, since it is larger than the sum of its proper divisors (40541).

406820731 is a wasteful number, since it uses less digits than its factorization.

406820731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40540.

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 406820731 is about 20169.7974952650. The cubic root of 406820731 is about 740.9706831897.

The spelling of 406820731 in words is "four hundred six million, eight hundred twenty thousand, seven hundred thirty-one".