42824981 has 4 divisors (see below), whose sum is σ = 44206464. Its totient is φ = 41443500.

The previous prime is 42824933. The next prime is 42824983. The reversal of 42824981 is 18942824.

42824981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 42824981 - 2²² = 38630677 is a prime.

It is a super-2 number, since 2×42824981² = 3667957995300722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42824983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 690695 + ... + 690756.

It is an arithmetic number, because the mean of its divisors is an integer number (11051616).

Almost surely, 2^42824981 is an apocalyptic number.

It is an amenable number.

42824981 is a deficient number, since it is larger than the sum of its proper divisors (1381483).

42824981 is a wasteful number, since it uses less digits than its factorization.

42824981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1381482.

The product of its digits is 36864, while the sum is 38.

The square root of 42824981 is about 6544.0798436449. The cubic root of 42824981 is about 349.8638409150.

The spelling of 42824981 in words is "forty-two million, eight hundred twenty-four thousand, nine hundred eighty-one".