29978540 has 12 divisors (see below), whose sum is σ = 62954976. Its totient is φ = 11991408.

The previous prime is 29978539. The next prime is 29978563. The reversal of 29978540 is 4587992.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 29978491 and 29978500.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 749444 + ... + 749483.

It is an arithmetic number, because the mean of its divisors is an integer number (5246248).

Almost surely, 2^29978540 is an apocalyptic number.

29978540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

29978540 is an abundant number, since it is smaller than the sum of its proper divisors (32976436).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

29978540 is a wasteful number, since it uses less digits than its factorization.

29978540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1498936 (or 1498934 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 44.

The square root of 29978540 is about 5475.2662035740. The cubic root of 29978540 is about 310.6491426891.

The spelling of 29978540 in words is "twenty-nine million, nine hundred seventy-eight thousand, five hundred forty".