29931945 has 16 divisors (see below), whose sum is σ = 48333120. Its totient is φ = 15816384.

The previous prime is 29931943. The next prime is 29931949. The reversal of 29931945 is 54913992.

It is not a de Polignac number, because 29931945 - 2¹ = 29931943 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 29931897 and 29931906.

It is not an unprimeable number, because it can be changed into a prime (29931943) 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 15 ways as a sum of consecutive naturals, for example, 7519 + ... + 10788.

It is an arithmetic number, because the mean of its divisors is an integer number (3020820).

Almost surely, 2^29931945 is an apocalyptic number.

It is an amenable number.

29931945 is a deficient number, since it is larger than the sum of its proper divisors (18401175).

29931945 is a wasteful number, since it uses less digits than its factorization.

29931945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18424.

The product of its digits is 87480, while the sum is 42.

The square root of 29931945 is about 5471.0095046527. The cubic root of 29931945 is about 310.4881141386.

It can be divided in two parts, 29931 and 945, that added together give a triangular number (30876 = T₂₄₈).

The spelling of 29931945 in words is "twenty-nine million, nine hundred thirty-one thousand, nine hundred forty-five".