684405942 has 32 divisors (see below), whose sum is σ = 1496582784. Its totient is φ = 206932800.

The previous prime is 684405923. The next prime is 684405961. The reversal of 684405942 is 249504486.

684405942 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (684405923) and next prime (684405961).

It is a super-2 number, since 2×684405942² = 936822986889814728, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 684405894 and 684405903.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18817 + ... + 41507.

It is an arithmetic number, because the mean of its divisors is an integer number (46768212).

Almost surely, 2^684405942 is an apocalyptic number.

684405942 is an abundant number, since it is smaller than the sum of its proper divisors (812176842).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

684405942 is a wasteful number, since it uses less digits than its factorization.

684405942 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23164.

The product of its (nonzero) digits is 276480, while the sum is 42.

The square root of 684405942 is about 26161.1533002656. The cubic root of 684405942 is about 881.2610802088.

The spelling of 684405942 in words is "six hundred eighty-four million, four hundred five thousand, nine hundred forty-two".