25401630 has 16 divisors (see below), whose sum is σ = 60963984. Its totient is φ = 6773760.

The previous prime is 25401611. The next prime is 25401631. The reversal of 25401630 is 3610452.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 25401597 and 25401606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25401631) 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, 423331 + ... + 423390.

It is an arithmetic number, because the mean of its divisors is an integer number (3810249).

Almost surely, 2^25401630 is an apocalyptic number.

25401630 is an abundant number, since it is smaller than the sum of its proper divisors (35562354).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25401630 is a wasteful number, since it uses less digits than its factorization.

25401630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 846731.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 25401630 is about 5040.0029761896. The cubic root of 25401630 is about 293.9592937302.

The spelling of 25401630 in words is "twenty-five million, four hundred one thousand, six hundred thirty".