25721434 has 16 divisors (see below), whose sum is σ = 40514400. Its totient is φ = 12230064.

The previous prime is 25721431. The next prime is 25721441. The reversal of 25721434 is 43412752.

It is a super-3 number, since 3×25721434³ (a number of 23 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (25721431) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 577 + ... + 7195.

It is an arithmetic number, because the mean of its divisors is an integer number (2532150).

Almost surely, 2^25721434 is an apocalyptic number.

25721434 is a deficient number, since it is larger than the sum of its proper divisors (14792966).

25721434 is a wasteful number, since it uses less digits than its factorization.

25721434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6717.

The product of its digits is 6720, while the sum is 28.

The square root of 25721434 is about 5071.6303098708. The cubic root of 25721434 is about 295.1877919492.

The spelling of 25721434 in words is "twenty-five million, seven hundred twenty-one thousand, four hundred thirty-four".