25443978 has 16 divisors (see below), whose sum is σ = 58157760. Its totient is φ = 7269696.

The previous prime is 25443959. The next prime is 25443989. The reversal of 25443978 is 87934452.

It is a Harshad number since it is a multiple of its sum of digits (42), and also a Moran number because the ratio is a prime number: 605809 = 25443978 / (2 + 5 + 4 + 4 + 3 + 9 + 7 + 8).

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 302863 + ... + 302946.

It is an arithmetic number, because the mean of its divisors is an integer number (3634860).

Almost surely, 2^25443978 is an apocalyptic number.

25443978 is an abundant number, since it is smaller than the sum of its proper divisors (32713782).

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

25443978 is a wasteful number, since it uses less digits than its factorization.

25443978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 605821.

The product of its digits is 241920, while the sum is 42.

The square root of 25443978 is about 5044.2024146539. The cubic root of 25443978 is about 294.1225598505.

The spelling of 25443978 in words is "twenty-five million, four hundred forty-three thousand, nine hundred seventy-eight".