684212387 has 12 divisors (see below), whose sum is σ = 706664328. Its totient is φ = 662428800.

The previous prime is 684212359. The next prime is 684212393. The reversal of 684212387 is 783212486.

It is not a de Polignac number, because 684212387 - 2⁸ = 684212131 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (684212327) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 228812 + ... + 231782.

It is an arithmetic number, because the mean of its divisors is an integer number (58888694).

Almost surely, 2^684212387 is an apocalyptic number.

684212387 is a deficient number, since it is larger than the sum of its proper divisors (22451941).

684212387 is a wasteful number, since it uses less digits than its factorization.

684212387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3190 (or 3149 counting only the distinct ones).

The product of its digits is 129024, while the sum is 41.

The square root of 684212387 is about 26157.4537560520. The cubic root of 684212387 is about 881.1779966857.

Subtracting 684212387 from its reverse (783212486), we obtain a palindrome (99000099).

The spelling of 684212387 in words is "six hundred eighty-four million, two hundred twelve thousand, three hundred eighty-seven".