684998406 has 24 divisors (see below), whose sum is σ = 1484678520. Its totient is φ = 228253536.

The previous prime is 684998381. The next prime is 684998423. The reversal of 684998406 is 604899486.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 71890 + ... + 80858.

It is an arithmetic number, because the mean of its divisors is an integer number (61861605).

Almost surely, 2^684998406 is an apocalyptic number.

684998406 is an abundant number, since it is smaller than the sum of its proper divisors (799680114).

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

684998406 is a wasteful number, since it uses less digits than its factorization.

684998406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13220 (or 13217 counting only the distinct ones).

The product of its (nonzero) digits is 2985984, while the sum is 54.

The square root of 684998406 is about 26172.4742047824. The cubic root of 684998406 is about 881.5152981841.

The spelling of 684998406 in words is "six hundred eighty-four million, nine hundred ninety-eight thousand, four hundred six".