42172737 has 4 divisors (see below), whose sum is σ = 56230320. Its totient is φ = 28115156.

The previous prime is 42172727. The next prime is 42172759. The reversal of 42172737 is 73727124.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 42172737 - 2⁴ = 42172721 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 42172698 and 42172707.

It is not an unprimeable number, because it can be changed into a prime (42172717) 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, 7028787 + ... + 7028792.

It is an arithmetic number, because the mean of its divisors is an integer number (14057580).

Almost surely, 2^42172737 is an apocalyptic number.

It is an amenable number.

42172737 is a deficient number, since it is larger than the sum of its proper divisors (14057583).

42172737 is a wasteful number, since it uses less digits than its factorization.

42172737 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14057582.

The product of its digits is 16464, while the sum is 33.

The square root of 42172737 is about 6494.0539726738. The cubic root of 42172737 is about 348.0785511014.

The spelling of 42172737 in words is "forty-two million, one hundred seventy-two thousand, seven hundred thirty-seven".