29399391 has 24 divisors (see below), whose sum is σ = 48688640. Its totient is φ = 16745616.

The previous prime is 29399389. The next prime is 29399407. The reversal of 29399391 is 19399392.

It is not a de Polignac number, because 29399391 - 2¹ = 29399389 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (29399311) 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 23 ways as a sum of consecutive naturals, for example, 27126 + ... + 28188.

Almost surely, 2^29399391 is an apocalyptic number.

29399391 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

29399391 is a deficient number, since it is larger than the sum of its proper divisors (19289249).

29399391 is a wasteful number, since it uses less digits than its factorization.

29399391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1515 (or 1512 counting only the distinct ones).

The product of its digits is 118098, while the sum is 45.

The square root of 29399391 is about 5422.1205261410. The cubic root of 29399391 is about 308.6356657306.

Adding to 29399391 its product of digits (118098), we get a square (29517489 = 5433²).

Subtracting from 29399391 its reverse (19399392), we obtain a palindrome (9999999).

The spelling of 29399391 in words is "twenty-nine million, three hundred ninety-nine thousand, three hundred ninety-one".