72102439 has 4 divisors (see below), whose sum is σ = 74588760. Its totient is φ = 69616120.

The previous prime is 72102413. The next prime is 72102449. The reversal of 72102439 is 93420127.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93420127 = 569 ⋅164183.

It is a cyclic number.

It is not a de Polignac number, because 72102439 - 2¹³ = 72094247 is a prime.

It is a Duffinian number.

72102439 is a modest number, since divided by 2439 gives 721 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72102449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1243117 + ... + 1243174.

It is an arithmetic number, because the mean of its divisors is an integer number (18647190).

Almost surely, 2^72102439 is an apocalyptic number.

72102439 is a deficient number, since it is larger than the sum of its proper divisors (2486321).

72102439 is a wasteful number, since it uses less digits than its factorization.

72102439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2486320.

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 72102439 is about 8491.3155046789. The cubic root of 72102439 is about 416.2139689915.

The spelling of 72102439 in words is "seventy-two million, one hundred two thousand, four hundred thirty-nine".