30961738 has 4 divisors (see below), whose sum is σ = 46442610. Its totient is φ = 15480868.

The previous prime is 30961729. The next prime is 30961741. The reversal of 30961738 is 83716903.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 83716903 = 37 ⋅2262619.

It can be written as a sum of positive squares in only one way, i.e., 20223009 + 10738729 = 4497^2 + 3277^2 .

It is a junction number, because it is equal to n+sod(n) for n = 30961697 and 30961706.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7740433 + ... + 7740436.

Almost surely, 2^30961738 is an apocalyptic number.

30961738 is a deficient number, since it is larger than the sum of its proper divisors (15480872).

30961738 is a wasteful number, since it uses less digits than its factorization.

30961738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15480871.

The product of its (nonzero) digits is 27216, while the sum is 37.

The square root of 30961738 is about 5564.3272729055. The cubic root of 30961738 is about 314.0087695497.

The spelling of 30961738 in words is "thirty million, nine hundred sixty-one thousand, seven hundred thirty-eight".