406684939 has 8 divisors (see below), whose sum is σ = 420036608. Its totient is φ = 393347880.

The previous prime is 406684933. The next prime is 406684961. The reversal of 406684939 is 939486604.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 406684939 - 2¹³ = 406676747 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 406684892 and 406684901.

It is not an unprimeable number, because it can be changed into a prime (406684933) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 100534 + ... + 104500.

It is an arithmetic number, because the mean of its divisors is an integer number (52504576).

Almost surely, 2^406684939 is an apocalyptic number.

406684939 is a deficient number, since it is larger than the sum of its proper divisors (13351669).

406684939 is a wasteful number, since it uses less digits than its factorization.

406684939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7305.

The product of its (nonzero) digits is 1119744, while the sum is 49.

The square root of 406684939 is about 20166.4309931133. The cubic root of 406684939 is about 740.8882315671. Note that the first 3 decimals are identical.

The spelling of 406684939 in words is "four hundred six million, six hundred eighty-four thousand, nine hundred thirty-nine".