42729975 has 54 divisors (see below), whose sum is σ = 80229240. Its totient is φ = 21737760.

The previous prime is 42729971. The next prime is 42729979. The reversal of 42729975 is 57992724.

It is an interprime number because it is at equal distance from previous prime (42729971) and next prime (42729979).

It is not a de Polignac number, because 42729975 - 2² = 42729971 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 42729975.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42729971) by changing a digit.

It is a polite number, since it can be written in 53 ways as a sum of consecutive naturals, for example, 118846 + ... + 119204.

Almost surely, 2^42729975 is an apocalyptic number.

42729975 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

42729975 is a deficient number, since it is larger than the sum of its proper divisors (37499265).

42729975 is a wasteful number, since it uses less digits than its factorization.

42729975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 421 (or 390 counting only the distinct ones).

The product of its digits is 317520, while the sum is 45.

The square root of 42729975 is about 6536.8168859163. The cubic root of 42729975 is about 349.6049283700.

The spelling of 42729975 in words is "forty-two million, seven hundred twenty-nine thousand, nine hundred seventy-five".