30126861 has 6 divisors (see below), whose sum is σ = 43516590. Its totient is φ = 20084568.

The previous prime is 30126857. The next prime is 30126869. The reversal of 30126861 is 16862103.

It can be written as a sum of positive squares in only one way, i.e., 18224361 + 11902500 = 4269^2 + 3450^2 .

It is not a de Polignac number, because 30126861 - 2² = 30126857 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30126869) 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, 1673706 + ... + 1673723.

It is an arithmetic number, because the mean of its divisors is an integer number (7252765).

Almost surely, 2^30126861 is an apocalyptic number.

It is an amenable number.

30126861 is a deficient number, since it is larger than the sum of its proper divisors (13389729).

30126861 is a wasteful number, since it uses less digits than its factorization.

30126861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3347435 (or 3347432 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 30126861 is about 5488.7941298613. The cubic root of 30126861 is about 311.1606198090.

Adding to 30126861 its reverse (16862103), we get a palindrome (46988964).

The spelling of 30126861 in words is "thirty million, one hundred twenty-six thousand, eight hundred sixty-one".