42634 has 4 divisors (see below), whose sum is σ = 63954. Its totient is φ = 21316.

The previous prime is 42611. The next prime is 42641. The reversal of 42634 is 43624.

42634 = T₁₄₄ + T₁₄₅ + ... + T₁₄₇.

42634 is an esthetic number in base 8, because in such base its adjacent digits differ by 1.

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

It can be written as a sum of positive squares in only one way, i.e., 21609 + 21025 = 147^2 + 145^2 .

It is a nialpdrome in base 9 and base 15.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10657 + ... + 10660.

2⁴²⁶³⁴ is an apocalyptic number.

42634 is a deficient number, since it is larger than the sum of its proper divisors (21320).

42634 is a wasteful number, since it uses less digits than its factorization.

42634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21319.

The product of its digits is 576, while the sum is 19.

The square root of 42634 is about 206.4800232468. The cubic root of 42634 is about 34.9342985120.

Subtracting 42634 from its reverse (43624), we obtain a triangular number (990 = T₄₄).

It can be divided in two parts, 42 and 634, that added together give a palindrome (676).

The spelling of 42634 in words is "forty-two thousand, six hundred thirty-four".