25729389 has 12 divisors (see below), whose sum is σ = 42474016. Its totient is φ = 14702472.

The previous prime is 25729367. The next prime is 25729397. The reversal of 25729389 is 98392752.

It is not a de Polignac number, because 25729389 - 2⁵ = 25729357 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25729339) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 204139 + ... + 204264.

Almost surely, 2^25729389 is an apocalyptic number.

It is an amenable number.

25729389 is a deficient number, since it is larger than the sum of its proper divisors (16744627).

25729389 is a wasteful number, since it uses less digits than its factorization.

25729389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 408416 (or 408413 counting only the distinct ones).

The product of its digits is 272160, while the sum is 45.

The square root of 25729389 is about 5072.4145138188. The cubic root of 25729389 is about 295.2182202273.

It can be divided in two parts, 257 and 29389, that added together give a triangular number (29646 = T₂₄₃).

The spelling of 25729389 in words is "twenty-five million, seven hundred twenty-nine thousand, three hundred eighty-nine".