8120749 has 16 divisors (see below), whose sum is σ = 10063872. Its totient is φ = 6380928.

The previous prime is 8120741. The next prime is 8120759. The reversal of 8120749 is 9470218.

It is a cyclic number.

It is not a de Polignac number, because 8120749 - 2³ = 8120741 is a prime.

8120749 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 8120749.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8120741) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21012 + ... + 21394.

It is an arithmetic number, because the mean of its divisors is an integer number (628992).

Almost surely, 2^8120749 is an apocalyptic number.

It is an amenable number.

8120749 is a deficient number, since it is larger than the sum of its proper divisors (1943123).

8120749 is a wasteful number, since it uses less digits than its factorization.

8120749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 636.

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

The square root of 8120749 is about 2849.6927904601. The cubic root of 8120749 is about 201.0012210845.

The spelling of 8120749 in words is "eight million, one hundred twenty thousand, seven hundred forty-nine".