25404431 has 4 divisors (see below), whose sum is σ = 27358632. Its totient is φ = 23450232.

The previous prime is 25404419. The next prime is 25404451. The reversal of 25404431 is 13440452.

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

It is not a de Polignac number, because 25404431 - 2¹⁰ = 25403407 is a prime.

It is a super-2 number, since 2×25404431² = 1290770228867522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25404397 and 25404406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25404451) 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 3 ways as a sum of consecutive naturals, for example, 977081 + ... + 977106.

It is an arithmetic number, because the mean of its divisors is an integer number (6839658).

Almost surely, 2^25404431 is an apocalyptic number.

25404431 is a deficient number, since it is larger than the sum of its proper divisors (1954201).

25404431 is a wasteful number, since it uses less digits than its factorization.

25404431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1954200.

The product of its (nonzero) digits is 1920, while the sum is 23.

The square root of 25404431 is about 5040.2808453498. The cubic root of 25404431 is about 293.9700981513.

Adding to 25404431 its reverse (13440452), we get a palindrome (38844883).

The spelling of 25404431 in words is "twenty-five million, four hundred four thousand, four hundred thirty-one".