73142138 has 4 divisors (see below), whose sum is σ = 109713210. Its totient is φ = 36571068.

The previous prime is 73142137. The next prime is 73142149. The reversal of 73142138 is 83124137.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 83124137 = 977 ⋅85081.

It can be written as a sum of positive squares in only one way, i.e., 60016009 + 13126129 = 7747^2 + 3623^2 .

It is a super-2 number, since 2×73142138² = 10699544702422088, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 73142138.

It is not an unprimeable number, because it can be changed into a prime (73142137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18285533 + ... + 18285536.

Almost surely, 2^73142138 is an apocalyptic number.

73142138 is a deficient number, since it is larger than the sum of its proper divisors (36571072).

73142138 is a wasteful number, since it uses less digits than its factorization.

73142138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36571071.

The product of its digits is 4032, while the sum is 29.

The square root of 73142138 is about 8552.3176975601. The cubic root of 73142138 is about 418.2049962493.

The spelling of 73142138 in words is "seventy-three million, one hundred forty-two thousand, one hundred thirty-eight".