30109978 has 4 divisors (see below), whose sum is σ = 45164970. Its totient is φ = 15054988.

The previous prime is 30109969. The next prime is 30109987. The reversal of 30109978 is 87990103.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 87990103 = 2273 ⋅38711.

It is an interprime number because it is at equal distance from previous prime (30109969) and next prime (30109987).

It can be written as a sum of positive squares in only one way, i.e., 30107169 + 2809 = 5487^2 + 53^2 .

It is a super-2 number, since 2×30109978² = 1813221550320968, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7527493 + ... + 7527496.

Almost surely, 2^30109978 is an apocalyptic number.

30109978 is a deficient number, since it is larger than the sum of its proper divisors (15054992).

30109978 is a wasteful number, since it uses less digits than its factorization.

30109978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15054991.

The product of its (nonzero) digits is 13608, while the sum is 37.

The square root of 30109978 is about 5487.2559626830. The cubic root of 30109978 is about 311.1024844641.

The spelling of 30109978 in words is "thirty million, one hundred nine thousand, nine hundred seventy-eight".