684431038 has 4 divisors (see below), whose sum is σ = 1026646560. Its totient is φ = 342215518.

The previous prime is 684431021. The next prime is 684431057. The reversal of 684431038 is 830134486.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 830134486 = 2 ⋅415067243.

It is a junction number, because it is equal to n+sod(n) for n = 684430988 and 684431006.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 171107758 + ... + 171107761.

It is an arithmetic number, because the mean of its divisors is an integer number (256661640).

Almost surely, 2^684431038 is an apocalyptic number.

684431038 is a deficient number, since it is larger than the sum of its proper divisors (342215522).

684431038 is a wasteful number, since it uses less digits than its factorization.

684431038 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 342215521.

The product of its (nonzero) digits is 55296, while the sum is 37.

The square root of 684431038 is about 26161.6329383317. The cubic root of 684431038 is about 881.2718515246.

The spelling of 684431038 in words is "six hundred eighty-four million, four hundred thirty-one thousand, thirty-eight".