684417925 has 6 divisors (see below), whose sum is σ = 848678258. Its totient is φ = 547534320.

The previous prime is 684417913. The next prime is 684417953. The reversal of 684417925 is 529714486.

It can be written as a sum of positive squares in 3 ways, for example, as 804609 + 683613316 = 897^2 + 26146^2 .

It is not a de Polignac number, because 684417925 - 2¹¹ = 684415877 is a prime.

It is a super-2 number, since 2×684417925² = 936855792122611250, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 13688334 + ... + 13688383.

Almost surely, 2^684417925 is an apocalyptic number.

It is an amenable number.

684417925 is a deficient number, since it is larger than the sum of its proper divisors (164260333).

684417925 is a wasteful number, since it uses less digits than its factorization.

684417925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27376727 (or 27376722 counting only the distinct ones).

The product of its digits is 483840, while the sum is 46.

The square root of 684417925 is about 26161.3823220410. The cubic root of 684417925 is about 881.2662233990.

It can be divided in two parts, 684 and 417925, that added together give a square (418609 = 647²).

The spelling of 684417925 in words is "six hundred eighty-four million, four hundred seventeen thousand, nine hundred twenty-five".