42720351 has 8 divisors (see below), whose sum is σ = 57012144. Its totient is φ = 28454400.

The previous prime is 42720347. The next prime is 42720367. The reversal of 42720351 is 15302724.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 42720351 - 2² = 42720347 is a prime.

It is a Smith number, since the sum of its digits (24) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42720331) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2200 + ... + 9501.

It is an arithmetic number, because the mean of its divisors is an integer number (7126518).

Almost surely, 2^42720351 is an apocalyptic number.

42720351 is a deficient number, since it is larger than the sum of its proper divisors (14291793).

42720351 is a wasteful number, since it uses less digits than its factorization.

42720351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12921.

The product of its (nonzero) digits is 1680, while the sum is 24.

The square root of 42720351 is about 6536.0807063561. The cubic root of 42720351 is about 349.5786794237.

It can be divided in two parts, 42720 and 351, that added together give a triangular number (43071 = T₂₉₃).

The spelling of 42720351 in words is "forty-two million, seven hundred twenty thousand, three hundred fifty-one".