42081797 has 4 divisors (see below), whose sum is σ = 42100620. Its totient is φ = 42062976.

The previous prime is 42081791. The next prime is 42081803. The reversal of 42081797 is 79718024.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (42081791) and next prime (42081803).

It can be written as a sum of positive squares in 2 ways, for example, as 35117476 + 6964321 = 5926^2 + 2639^2 .

It is a cyclic number.

It is not a de Polignac number, because 42081797 - 2⁸ = 42081541 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 42081797.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42081791) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5522 + ... + 10707.

It is an arithmetic number, because the mean of its divisors is an integer number (10525155).

Almost surely, 2^42081797 is an apocalyptic number.

It is an amenable number.

42081797 is a deficient number, since it is larger than the sum of its proper divisors (18823).

42081797 is a wasteful number, since it uses less digits than its factorization.

42081797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18822.

The product of its (nonzero) digits is 28224, while the sum is 38.

The square root of 42081797 is about 6487.0484043207. The cubic root of 42081797 is about 347.8281757345.

The spelling of 42081797 in words is "forty-two million, eighty-one thousand, seven hundred ninety-seven".