861684542 has 32 divisors (see below), whose sum is σ = 1460954880. Its totient is φ = 378725760.

The previous prime is 861684541. The next prime is 861684553. The reversal of 861684542 is 245486168.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 861684493 and 861684502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861684541) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36473 + ... + 55259.

It is an arithmetic number, because the mean of its divisors is an integer number (45654840).

Almost surely, 2^861684542 is an apocalyptic number.

861684542 is a deficient number, since it is larger than the sum of its proper divisors (599270338).

861684542 is a wasteful number, since it uses less digits than its factorization.

861684542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18896.

The product of its digits is 368640, while the sum is 44.

The square root of 861684542 is about 29354.4637491472. The cubic root of 861684542 is about 951.5890458163.

The spelling of 861684542 in words is "eight hundred sixty-one million, six hundred eighty-four thousand, five hundred forty-two".