30780149 has 4 divisors (see below), whose sum is σ = 32590764. Its totient is φ = 28969536.

The previous prime is 30780143. The next prime is 30780151. The reversal of 30780149 is 94108703.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 94108703 = 13 ⋅7239131.

It can be written as a sum of positive squares in 2 ways, for example, as 23107249 + 7672900 = 4807^2 + 2770^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30780149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30780143) 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, 905282 + ... + 905315.

It is an arithmetic number, because the mean of its divisors is an integer number (8147691).

Almost surely, 2^30780149 is an apocalyptic number.

It is an amenable number.

30780149 is a deficient number, since it is larger than the sum of its proper divisors (1810615).

30780149 is a wasteful number, since it uses less digits than its factorization.

30780149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1810614.

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 30780149 is about 5547.9860309846. The cubic root of 30780149 is about 313.3936837377.

The spelling of 30780149 in words is "thirty million, seven hundred eighty thousand, one hundred forty-nine".