8720149 has 4 divisors (see below), whose sum is σ = 8843040. Its totient is φ = 8597260.

The previous prime is 8720137. The next prime is 8720161. The reversal of 8720149 is 9410278.

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, and also an emirpimes, since its reverse is a distinct semiprime: 9410278 = 2 ⋅4705139.

It is an interprime number because it is at equal distance from previous prime (8720137) and next prime (8720161).

It is a cyclic number.

It is not a de Polignac number, because 8720149 - 2¹⁵ = 8687381 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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 8720149.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8720119) 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, 61339 + ... + 61480.

It is an arithmetic number, because the mean of its divisors is an integer number (2210760).

Almost surely, 2^8720149 is an apocalyptic number.

It is an amenable number.

8720149 is a deficient number, since it is larger than the sum of its proper divisors (122891).

8720149 is a wasteful number, since it uses less digits than its factorization.

8720149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122890.

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 8720149 is about 2952.9898408223. The cubic root of 8720149 is about 205.8296656488.

The spelling of 8720149 in words is "eight million, seven hundred twenty thousand, one hundred forty-nine".