82139297 has 8 divisors (see below), whose sum is σ = 84541032. Its totient is φ = 79747200.

The previous prime is 82139273. The next prime is 82139303. The reversal of 82139297 is 79293128.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 43151761 + 38987536 = 6569^2 + 6244^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 82139297 - 2¹⁴ = 82122913 is a prime.

It is a super-2 number, since 2×82139297² = 13493728223308418, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (82130297) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17147 + ... + 21407.

It is an arithmetic number, because the mean of its divisors is an integer number (10567629).

Almost surely, 2^82139297 is an apocalyptic number.

It is an amenable number.

82139297 is a deficient number, since it is larger than the sum of its proper divisors (2401735).

82139297 is a wasteful number, since it uses less digits than its factorization.

82139297 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4819.

The product of its digits is 54432, while the sum is 41.

The square root of 82139297 is about 9063.0732646272. The cubic root of 82139297 is about 434.6940147892.

The spelling of 82139297 in words is "eighty-two million, one hundred thirty-nine thousand, two hundred ninety-seven".