7139749 has 4 divisors (see below), whose sum is σ = 7145100. Its totient is φ = 7134400.

The previous prime is 7139731. The next prime is 7139753. The reversal of 7139749 is 9479317.

7139749 is nontrivially palindromic in base 7.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 9479317 = 29 ⋅326873.

It can be written as a sum of positive squares in 2 ways, for example, as 5336100 + 1803649 = 2310^2 + 1343^2 .

It is a cyclic number.

It is not a de Polignac number, because 7139749 - 2⁷ = 7139621 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 (7139449) 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 3 ways as a sum of consecutive naturals, for example, 1149 + ... + 3949.

It is an arithmetic number, because the mean of its divisors is an integer number (1786275).

Almost surely, 2^7139749 is an apocalyptic number.

It is an amenable number.

7139749 is a deficient number, since it is larger than the sum of its proper divisors (5351).

7139749 is a wasteful number, since it uses less digits than its factorization.

7139749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5350.

The product of its digits is 47628, while the sum is 40.

The square root of 7139749 is about 2672.0308755701. The cubic root of 7139749 is about 192.5577405920.

The spelling of 7139749 in words is "seven million, one hundred thirty-nine thousand, seven hundred forty-nine".