11978530 has 32 divisors (see below), whose sum is σ = 22289904. Its totient is φ = 4632576.

The previous prime is 11978507. The next prime is 11978539. The reversal of 11978530 is 3587911.

It is a happy number.

11978530 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 4322241 + 7656289 = 2079^2 + 2767^2 .

It is not an unprimeable number, because it can be changed into a prime (11978539) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51294 + ... + 51526.

Almost surely, 2^11978530 is an apocalyptic number.

11978530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

11978530 is a deficient number, since it is larger than the sum of its proper divisors (10311374).

11978530 is a wasteful number, since it uses less digits than its factorization.

11978530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 390.

The product of its (nonzero) digits is 7560, while the sum is 34.

The square root of 11978530 is about 3461.0013002020. The cubic root of 11978530 is about 228.8062280283.

The spelling of 11978530 in words is "eleven million, nine hundred seventy-eight thousand, five hundred thirty".