29999919 has 4 divisors (see below), whose sum is σ = 39999896. Its totient is φ = 19999944.

The previous prime is 29999903. The next prime is 29999923. The reversal of 29999919 is 91999992.

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

It is not a de Polignac number, because 29999919 - 2⁴ = 29999903 is a prime.

It is a super-2 number, since 2×29999919² = 1799990280013122, 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 (29999989) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4999984 + ... + 4999989.

It is an arithmetic number, because the mean of its divisors is an integer number (9999974).

Almost surely, 2^29999919 is an apocalyptic number.

29999919 is a deficient number, since it is larger than the sum of its proper divisors (9999977).

29999919 is an equidigital number, since it uses as much as digits as its factorization.

29999919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9999976.

The product of its digits is 1062882, while the sum is 57.

The square root of 29999919 is about 5477.2181807921. The cubic root of 29999919 is about 310.7229709442.

The spelling of 29999919 in words is "twenty-nine million, nine hundred ninety-nine thousand, nine hundred nineteen".