29981957 has 4 divisors (see below), whose sum is σ = 30078060. Its totient is φ = 29885856.

The previous prime is 29981893. The next prime is 29981977. The reversal of 29981957 is 75918992.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3500641 + 26481316 = 1871^2 + 5146^2 .

It is a cyclic number.

It is not a de Polignac number, because 29981957 - 2⁶ = 29981893 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (29981977) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 47582 + ... + 48207.

It is an arithmetic number, because the mean of its divisors is an integer number (7519515).

Almost surely, 2^29981957 is an apocalyptic number.

It is an amenable number.

29981957 is a deficient number, since it is larger than the sum of its proper divisors (96103).

29981957 is an equidigital number, since it uses as much as digits as its factorization.

29981957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96102.

The product of its digits is 408240, while the sum is 50.

The square root of 29981957 is about 5475.5782343055. The cubic root of 29981957 is about 310.6609449960.

The spelling of 29981957 in words is "twenty-nine million, nine hundred eighty-one thousand, nine hundred fifty-seven".