29139547 has 4 divisors (see below), whose sum is σ = 30853656. Its totient is φ = 27425440.

The previous prime is 29139541. The next prime is 29139587. The reversal of 29139547 is 74593192.

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

It is a cyclic number.

It is not a de Polignac number, because 29139547 - 2¹¹ = 29137499 is a prime.

It is a super-2 number, since 2×29139547² = 1698226398730418, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (29139541) 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, 857029 + ... + 857062.

It is an arithmetic number, because the mean of its divisors is an integer number (7713414).

Almost surely, 2^29139547 is an apocalyptic number.

29139547 is a deficient number, since it is larger than the sum of its proper divisors (1714109).

29139547 is a wasteful number, since it uses less digits than its factorization.

29139547 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1714108.

The product of its digits is 68040, while the sum is 40.

The square root of 29139547 is about 5398.1058715072. The cubic root of 29139547 is about 307.7236903231.

The spelling of 29139547 in words is "twenty-nine million, one hundred thirty-nine thousand, five hundred forty-seven".