724490842 has 4 divisors (see below), whose sum is σ = 1086736266. Its totient is φ = 362245420.

The previous prime is 724490831. The next prime is 724490857. The reversal of 724490842 is 248094427.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 248094427 = 7 ⋅35442061.

It can be written as a sum of positive squares in only one way, i.e., 533194281 + 191296561 = 23091^2 + 13831^2 .

It is a junction number, because it is equal to n+sod(n) for n = 724490795 and 724490804.

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, 181122709 + ... + 181122712.

Almost surely, 2^724490842 is an apocalyptic number.

724490842 is a deficient number, since it is larger than the sum of its proper divisors (362245424).

724490842 is a wasteful number, since it uses less digits than its factorization.

724490842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 362245423.

The product of its (nonzero) digits is 129024, while the sum is 40.

The square root of 724490842 is about 26916.3675483896. The cubic root of 724490842 is about 898.1405403026.

The spelling of 724490842 in words is "seven hundred twenty-four million, four hundred ninety thousand, eight hundred forty-two".