842724861 has 32 divisors (see below), whose sum is σ = 1248127488. Its totient is φ = 501483840.

The previous prime is 842724859. The next prime is 842724871. The reversal of 842724861 is 168427248.

It is not a de Polignac number, because 842724861 - 2¹ = 842724859 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (842724811) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1244455 + ... + 1245131.

It is an arithmetic number, because the mean of its divisors is an integer number (39003984).

Almost surely, 2^842724861 is an apocalyptic number.

It is an amenable number.

842724861 is a deficient number, since it is larger than the sum of its proper divisors (405402627).

842724861 is a wasteful number, since it uses less digits than its factorization.

842724861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1321.

The product of its digits is 172032, while the sum is 42.

The square root of 842724861 is about 29029.7237499774. The cubic root of 842724861 is about 944.5579377484.

It can be divided in two parts, 84 and 2724861, that added together give a triangular number (2724945 = T₂₃₃₄).

The spelling of 842724861 in words is "eight hundred forty-two million, seven hundred twenty-four thousand, eight hundred sixty-one".