42720426 has 32 divisors (see below), whose sum is σ = 108497280. Its totient is φ = 12205728.

The previous prime is 42720389. The next prime is 42720427. The reversal of 42720426 is 62402724.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 42720426.

It is not an unprimeable number, because it can be changed into a prime (42720427) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 56131 + ... + 56886.

It is an arithmetic number, because the mean of its divisors is an integer number (3390540).

Almost surely, 2^42720426 is an apocalyptic number.

42720426 is an abundant number, since it is smaller than the sum of its proper divisors (65776854).

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

42720426 is a wasteful number, since it uses less digits than its factorization.

42720426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113035 (or 113029 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 27.

The square root of 42720426 is about 6536.0864437368. The cubic root of 42720426 is about 349.5788839974.

The spelling of 42720426 in words is "forty-two million, seven hundred twenty thousand, four hundred twenty-six".