29971540 has 12 divisors (see below), whose sum is σ = 62940276. Its totient is φ = 11988608.

The previous prime is 29971523. The next prime is 29971541. The reversal of 29971540 is 4517992.

It can be written as a sum of positive squares in 2 ways, for example, as 16924996 + 13046544 = 4114^2 + 3612^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 29971540.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (29971541) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 749269 + ... + 749308.

It is an arithmetic number, because the mean of its divisors is an integer number (5245023).

Almost surely, 2^29971540 is an apocalyptic number.

29971540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

29971540 is an abundant number, since it is smaller than the sum of its proper divisors (32968736).

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

29971540 is a wasteful number, since it uses less digits than its factorization.

29971540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1498586 (or 1498584 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 37.

The square root of 29971540 is about 5474.6269279285. The cubic root of 29971540 is about 310.6249619110.

The spelling of 29971540 in words is "twenty-nine million, nine hundred seventy-one thousand, five hundred forty".