73257139 has 4 divisors (see below), whose sum is σ = 76442256. Its totient is φ = 70072024.

The previous prime is 73257137. The next prime is 73257143. The reversal of 73257139 is 93175237.

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

It is a cyclic number.

It is not a de Polignac number, because 73257139 - 2¹ = 73257137 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 73257098 and 73257107.

It is not an unprimeable number, because it can be changed into a prime (73257137) 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, 1592524 + ... + 1592569.

It is an arithmetic number, because the mean of its divisors is an integer number (19110564).

Almost surely, 2^73257139 is an apocalyptic number.

73257139 is a deficient number, since it is larger than the sum of its proper divisors (3185117).

73257139 is a wasteful number, since it uses less digits than its factorization.

73257139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3185116.

The product of its digits is 39690, while the sum is 37.

The square root of 73257139 is about 8559.0384389837. The cubic root of 73257139 is about 418.4240619848.

The spelling of 73257139 in words is "seventy-three million, two hundred fifty-seven thousand, one hundred thirty-nine".