29427381 has 20 divisors (see below), whose sum is σ = 45036684. Its totient is φ = 19137600.

The previous prime is 29427367. The next prime is 29427407. The reversal of 29427381 is 18372492.

It can be written as a sum of positive squares in 2 ways, for example, as 16402500 + 13024881 = 4050^2 + 3609^2 .

It is not a de Polignac number, because 29427381 - 2⁶ = 29427317 is a prime.

It is a super-2 number, since 2×29427381² = 1731941505038322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (29427301) 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 19 ways as a sum of consecutive naturals, for example, 1110 + ... + 7751.

Almost surely, 2^29427381 is an apocalyptic number.

It is an amenable number.

29427381 is a deficient number, since it is larger than the sum of its proper divisors (15609303).

29427381 is an equidigital number, since it uses as much as digits as its factorization.

29427381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8914 (or 8905 counting only the distinct ones).

The product of its digits is 24192, while the sum is 36.

The square root of 29427381 is about 5424.7010055855. The cubic root of 29427381 is about 308.7335812760.

The spelling of 29427381 in words is "twenty-nine million, four hundred twenty-seven thousand, three hundred eighty-one".