7139421 has 20 divisors (see below), whose sum is σ = 11228800. Its totient is φ = 4508136.

The previous prime is 7139401. The next prime is 7139437. The reversal of 7139421 is 1249317.

It is not a de Polignac number, because 7139421 - 2⁶ = 7139357 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7139401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 781 + ... + 3858.

It is an arithmetic number, because the mean of its divisors is an integer number (561440).

Almost surely, 2^7139421 is an apocalyptic number.

It is an amenable number.

7139421 is a deficient number, since it is larger than the sum of its proper divisors (4089379).

7139421 is a wasteful number, since it uses less digits than its factorization.

7139421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4670 (or 4661 counting only the distinct ones).

The product of its digits is 1512, while the sum is 27.

The square root of 7139421 is about 2671.9694983289. The cubic root of 7139421 is about 192.5547918466.

The spelling of 7139421 in words is "seven million, one hundred thirty-nine thousand, four hundred twenty-one".