684101387 has 4 divisors (see below), whose sum is σ = 707691120. Its totient is φ = 660511656.

The previous prime is 684101371. The next prime is 684101389. The reversal of 684101387 is 783101486.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 684101387 - 2⁴ = 684101371 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 684101387.

It is not an unprimeable number, because it can be changed into a prime (684101389) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11794823 + ... + 11794880.

It is an arithmetic number, because the mean of its divisors is an integer number (176922780).

Almost surely, 2^684101387 is an apocalyptic number.

684101387 is a deficient number, since it is larger than the sum of its proper divisors (23589733).

684101387 is a wasteful number, since it uses less digits than its factorization.

684101387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23589732.

The product of its (nonzero) digits is 32256, while the sum is 38.

The square root of 684101387 is about 26155.3319038394. The cubic root of 684101387 is about 881.1303428435.

Subtracting 684101387 from its reverse (783101486), we obtain a palindrome (99000099).

The spelling of 684101387 in words is "six hundred eighty-four million, one hundred one thousand, three hundred eighty-seven".