8121744 has 30 divisors (see below), whose sum is σ = 22730006. Its totient is φ = 2707200.

The previous prime is 8121739. The next prime is 8121749. The reversal of 8121744 is 4471218.

It is an interprime number because it is at equal distance from previous prime (8121739) and next prime (8121749).

It can be written as a sum of positive squares in only one way, i.e., 7290000 + 831744 = 2700^2 + 912^2 .

It is an Ulam number.

It is a zygodrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (8121749) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 28057 + ... + 28344.

Almost surely, 2^8121744 is an apocalyptic number.

It is an amenable number.

8121744 is an abundant number, since it is smaller than the sum of its proper divisors (14608262).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

8121744 is a wasteful number, since it uses less digits than its factorization.

8121744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56415 (or 56406 counting only the distinct ones).

The product of its digits is 1792, while the sum is 27.

The square root of 8121744 is about 2849.8673653347. The cubic root of 8121744 is about 201.0094300172.

It can be divided in two parts, 812 and 1744, that added together give a triangular number (2556 = T₇₁).

The spelling of 8121744 in words is "eight million, one hundred twenty-one thousand, seven hundred forty-four".