29668981 has 8 divisors (see below), whose sum is σ = 29989944. Its totient is φ = 29350080.

The previous prime is 29668979. The next prime is 29668987. The reversal of 29668981 is 18986692.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 2722500 + 26946481 = 1650^2 + 5191^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 29668981 - 2¹ = 29668979 is a prime.

It is a super-2 number, since 2×29668981² = 1760496867156722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (29668987) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54571 + ... + 55111.

It is an arithmetic number, because the mean of its divisors is an integer number (3748743).

Almost surely, 2^29668981 is an apocalyptic number.

It is an amenable number.

29668981 is a deficient number, since it is larger than the sum of its proper divisors (320963).

29668981 is a wasteful number, since it uses less digits than its factorization.

29668981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1031.

The product of its digits is 373248, while the sum is 49.

The square root of 29668981 is about 5446.9239943293. The cubic root of 29668981 is about 309.5761846341.

The spelling of 29668981 in words is "twenty-nine million, six hundred sixty-eight thousand, nine hundred eighty-one".