25143994 has 4 divisors (see below), whose sum is σ = 37715994. Its totient is φ = 12571996.

The previous prime is 25143931. The next prime is 25144019. The reversal of 25143994 is 49934152.

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

It can be written as a sum of positive squares in only one way, i.e., 18190225 + 6953769 = 4265^2 + 2637^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6285997 + ... + 6286000.

Almost surely, 2^25143994 is an apocalyptic number.

25143994 is a deficient number, since it is larger than the sum of its proper divisors (12572000).

25143994 is a wasteful number, since it uses less digits than its factorization.

25143994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12571999.

The product of its digits is 38880, while the sum is 37.

The square root of 25143994 is about 5014.3787252261. The cubic root of 25143994 is about 292.9620874505.

It can be divided in two parts, 2514399 and 4, that added together give a triangular number (2514403 = T₂₂₄₂).

The spelling of 25143994 in words is "twenty-five million, one hundred forty-three thousand, nine hundred ninety-four".