42129277 has 4 divisors (see below), whose sum is σ = 42149916. Its totient is φ = 42108640.

The previous prime is 42129259. The next prime is 42129287. The reversal of 42129277 is 77292124.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11148921 + 30980356 = 3339^2 + 5566^2 .

It is a cyclic number.

It is not a de Polignac number, because 42129277 - 2⁷ = 42129149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42129287) 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, 6874 + ... + 11467.

It is an arithmetic number, because the mean of its divisors is an integer number (10537479).

Almost surely, 2^42129277 is an apocalyptic number.

It is an amenable number.

42129277 is a deficient number, since it is larger than the sum of its proper divisors (20639).

42129277 is a wasteful number, since it uses less digits than its factorization.

42129277 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20638.

The product of its digits is 14112, while the sum is 34.

The square root of 42129277 is about 6490.7069722797. The cubic root of 42129277 is about 347.9589422870.

The spelling of 42129277 in words is "forty-two million, one hundred twenty-nine thousand, two hundred seventy-seven".