82739421 has 16 divisors (see below), whose sum is σ = 122742400. Its totient is φ = 55085184.

The previous prime is 82739399. The next prime is 82739429. The reversal of 82739421 is 12493728.

It is not a de Polignac number, because 82739421 - 2¹⁸ = 82477277 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82739429) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24525 + ... + 27693.

It is an arithmetic number, because the mean of its divisors is an integer number (7671400).

Almost surely, 2^82739421 is an apocalyptic number.

It is an amenable number.

82739421 is a deficient number, since it is larger than the sum of its proper divisors (40002979).

82739421 is a wasteful number, since it uses less digits than its factorization.

82739421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4145 (or 4139 counting only the distinct ones).

The product of its digits is 24192, while the sum is 36.

The square root of 82739421 is about 9096.1212063165. The cubic root of 82739421 is about 435.7500970195.

The spelling of 82739421 in words is "eighty-two million, seven hundred thirty-nine thousand, four hundred twenty-one".