42724381 has 16 divisors (see below), whose sum is σ = 50408064. Its totient is φ = 35446464.

The previous prime is 42724373. The next prime is 42724387. The reversal of 42724381 is 18342724.

It is a cyclic number.

It is not a de Polignac number, because 42724381 - 2³ = 42724373 is a prime.

It is a super-2 number, since 2×42724381² = 3650745463666322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42724387) 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, 75606 + ... + 76168.

It is an arithmetic number, because the mean of its divisors is an integer number (3150504).

Almost surely, 2^42724381 is an apocalyptic number.

It is an amenable number.

42724381 is a deficient number, since it is larger than the sum of its proper divisors (7683683).

42724381 is a wasteful number, since it uses less digits than its factorization.

42724381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 900.

The product of its digits is 10752, while the sum is 31.

The square root of 42724381 is about 6536.3889878128. The cubic root of 42724381 is about 349.5896715133.

The spelling of 42724381 in words is "forty-two million, seven hundred twenty-four thousand, three hundred eighty-one".