42172949 has 16 divisors (see below), whose sum is σ = 52687488. Its totient is φ = 32864832.

The previous prime is 42172939. The next prime is 42172957. The reversal of 42172949 is 94927124.

It is a de Polignac number, because none of the positive numbers 2^k-42172949 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42172909) 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, 2639 + ... + 9555.

It is an arithmetic number, because the mean of its divisors is an integer number (3292968).

Almost surely, 2^42172949 is an apocalyptic number.

It is an amenable number.

42172949 is a deficient number, since it is larger than the sum of its proper divisors (10514539).

42172949 is a wasteful number, since it uses less digits than its factorization.

42172949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7004.

The product of its digits is 36288, while the sum is 38.

The square root of 42172949 is about 6494.0702952771. The cubic root of 42172949 is about 348.0791343576.

The spelling of 42172949 in words is "forty-two million, one hundred seventy-two thousand, nine hundred forty-nine".