32139421 has 8 divisors (see below), whose sum is σ = 33205464. Its totient is φ = 31083840.

The previous prime is 32139397. The next prime is 32139473. The reversal of 32139421 is 12493123.

It can be written as a sum of positive squares in 4 ways, for example, as 25452025 + 6687396 = 5045^2 + 2586^2 .

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 32139421 - 2¹¹ = 32137373 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 (32139721) 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, 3891 + ... + 8911.

It is an arithmetic number, because the mean of its divisors is an integer number (4150683).

Almost surely, 2^32139421 is an apocalyptic number.

It is an amenable number.

32139421 is a deficient number, since it is larger than the sum of its proper divisors (1066043).

32139421 is a wasteful number, since it uses less digits than its factorization.

32139421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5231.

The product of its digits is 1296, while the sum is 25.

The square root of 32139421 is about 5669.1640477234. The cubic root of 32139421 is about 317.9406195574.

The spelling of 32139421 in words is "thirty-two million, one hundred thirty-nine thousand, four hundred twenty-one".