7872149 has 2 divisors, whose sum is σ = 7872150. Its totient is φ = 7872148.

The previous prime is 7872131. The next prime is 7872181. The reversal of 7872149 is 9412787.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7524049 + 348100 = 2743^2 + 590^2 .

It is a cyclic number.

It is not a de Polignac number, because 7872149 - 2⁸ = 7871893 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is an alternating number because its digits alternate between odd and even.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7872119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3936074 + 3936075.

It is an arithmetic number, because the mean of its divisors is an integer number (3936075).

Almost surely, 2^7872149 is an apocalyptic number.

It is an amenable number.

7872149 is a deficient number, since it is larger than the sum of its proper divisors (1).

7872149 is an equidigital number, since it uses as much as digits as its factorization.

7872149 is an evil number, because the sum of its binary digits is even.

The product of its digits is 28224, while the sum is 38.

The square root of 7872149 is about 2805.7350195626. The cubic root of 7872149 is about 198.9288484131.

It can be divided in two parts, 78 and 72149, that added together give a palindrome (72227).

The spelling of 7872149 in words is "seven million, eight hundred seventy-two thousand, one hundred forty-nine".