42391528 has 8 divisors (see below), whose sum is σ = 79484130. Its totient is φ = 21195760.

The previous prime is 42391513. The next prime is 42391537. The reversal of 42391528 is 82519324.

It can be written as a sum of positive squares in only one way, i.e., 31382404 + 11009124 = 5602^2 + 3318^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 42391493 and 42391502.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2649463 + ... + 2649478.

Almost surely, 2^42391528 is an apocalyptic number.

It is an amenable number.

42391528 is a deficient number, since it is larger than the sum of its proper divisors (37092602).

42391528 is a wasteful number, since it uses less digits than its factorization.

42391528 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5298947 (or 5298943 counting only the distinct ones).

The product of its digits is 17280, while the sum is 34.

The square root of 42391528 is about 6510.8776674117. The cubic root of 42391528 is about 348.6794537916.

The spelling of 42391528 in words is "forty-two million, three hundred ninety-one thousand, five hundred twenty-eight".