3172421638 has 8 divisors (see below), whose sum is σ = 4779972288. Its totient is φ = 1579097544.

The previous prime is 3172421627. The next prime is 3172421639. The reversal of 3172421638 is 8361242713.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 3172421597 and 3172421606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3172421639) 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, 3556081 + ... + 3556972.

It is an arithmetic number, because the mean of its divisors is an integer number (597496536).

Almost surely, 2^3172421638 is an apocalyptic number.

3172421638 is a deficient number, since it is larger than the sum of its proper divisors (1607550650).

3172421638 is a wasteful number, since it uses less digits than its factorization.

3172421638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7113278.

The product of its digits is 48384, while the sum is 37.

The square root of 3172421638 is about 56324.2544380305. The cubic root of 3172421638 is about 1469.3670648923.

The spelling of 3172421638 in words is "three billion, one hundred seventy-two million, four hundred twenty-one thousand, six hundred thirty-eight".