25400142 has 80 divisors (see below), whose sum is σ = 63040032. Its totient is φ = 7603200.

The previous prime is 25400083. The next prime is 25400147. The reversal of 25400142 is 24100452.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25400147) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 63142 + ... + 63542.

Almost surely, 2^25400142 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25400142, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31520016).

25400142 is an abundant number, since it is smaller than the sum of its proper divisors (37639890).

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

25400142 is a wasteful number, since it uses less digits than its factorization.

25400142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 455 (or 446 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

The square root of 25400142 is about 5039.8553550672. The cubic root of 25400142 is about 293.9535536790.

Adding to 25400142 its reverse (24100452), we get a palindrome (49500594).

The spelling of 25400142 in words is "twenty-five million, four hundred thousand, one hundred forty-two".