142672321 has 4 divisors (see below), whose sum is σ = 155642544. Its totient is φ = 129702100.

The previous prime is 142672303. The next prime is 142672357. The reversal of 142672321 is 123276241.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 142672321 - 2²⁵ = 109117889 is a prime.

It is a super-3 number, since 3×142672321³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 142672321.

It is not an unprimeable number, because it can be changed into a prime (142672301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6485095 + ... + 6485116.

It is an arithmetic number, because the mean of its divisors is an integer number (38910636).

Almost surely, 2^142672321 is an apocalyptic number.

142672321 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

142672321 is a deficient number, since it is larger than the sum of its proper divisors (12970223).

142672321 is a wasteful number, since it uses less digits than its factorization.

142672321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12970222.

The product of its digits is 4032, while the sum is 28.

The square root of 142672321 is about 11944.5519380176. The cubic root of 142672321 is about 522.5324213912.

The spelling of 142672321 in words is "one hundred forty-two million, six hundred seventy-two thousand, three hundred twenty-one".