107721842 has 18 divisors (see below), whose sum is σ = 166550349. Its totient is φ = 52253680.

The previous prime is 107721827. The next prime is 107721851. The reversal of 107721842 is 248127701.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 76930441 + 30791401 = 8771^2 + 5549^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=7339.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 107721799 and 107721808.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 601709 + ... + 601887.

Almost surely, 2^107721842 is an apocalyptic number.

107721842 is a deficient number, since it is larger than the sum of its proper divisors (58828507).

107721842 is an frugal number, since it uses more digits than its factorization.

107721842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 442 (or 222 counting only the distinct ones).

The product of its (nonzero) digits is 6272, while the sum is 32.

The square root of 107721842 is about 10378.9133342561. The cubic root of 107721842 is about 475.8111230721.

Multiplying 107721842 by its sum of digits (32), we get a square (3447098944 = 58712²).

Multiplying 107721842 by its product of nonzero digits (6272), we get a square (675631393024 = 821968²).

The spelling of 107721842 in words is "one hundred seven million, seven hundred twenty-one thousand, eight hundred forty-two".