29999890 has 16 divisors (see below), whose sum is σ = 54065880. Its totient is φ = 11985280.

The previous prime is 29999887. The next prime is 29999899. The reversal of 29999890 is 9899992.

It can be written as a sum of positive squares in 4 ways, for example, as 26224641 + 3775249 = 5121^2 + 1943^2 .

It is not an unprimeable number, because it can be changed into a prime (29999899) 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 7 ways as a sum of consecutive naturals, for example, 11070 + ... + 13510.

Almost surely, 2^29999890 is an apocalyptic number.

29999890 is a deficient number, since it is larger than the sum of its proper divisors (24065990).

29999890 is a wasteful number, since it uses less digits than its factorization.

29999890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3677.

The product of its (nonzero) digits is 944784, while the sum is 55.

The square root of 29999890 is about 5477.2155334622. The cubic root of 29999890 is about 310.7228708221.

The spelling of 29999890 in words is "twenty-nine million, nine hundred ninety-nine thousand, eight hundred ninety".