42720894 has 12 divisors (see below), whose sum is σ = 92561976. Its totient is φ = 14240292.

The previous prime is 42720889. The next prime is 42720901. The reversal of 42720894 is 49802724.

It is a Curzon number.

It is a congruent number.

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 in 5 ways as a sum of consecutive naturals, for example, 1186674 + ... + 1186709.

It is an arithmetic number, because the mean of its divisors is an integer number (7713498).

Almost surely, 2^42720894 is an apocalyptic number.

42720894 is an abundant number, since it is smaller than the sum of its proper divisors (49841082).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

42720894 is a wasteful number, since it uses less digits than its factorization.

42720894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2373391 (or 2373388 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The square root of 42720894 is about 6536.1222448788. The cubic root of 42720894 is about 349.5801605322.

It can be divided in two parts, 427 and 20894, that added together give a triangular number (21321 = T₂₀₆).

The spelling of 42720894 in words is "forty-two million, seven hundred twenty thousand, eight hundred ninety-four".