25140731 has 8 divisors (see below), whose sum is σ = 31344384. Its totient is φ = 19590120.

The previous prime is 25140707. The next prime is 25140737. The reversal of 25140731 is 13704152.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-25140731 is a prime.

It is a super-2 number, since 2×25140731² = 1264112710428722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25140697 and 25140706.

It is not an unprimeable number, because it can be changed into a prime (25140737) 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, 163175 + ... + 163328.

It is an arithmetic number, because the mean of its divisors is an integer number (3918048).

Almost surely, 2^25140731 is an apocalyptic number.

25140731 is a deficient number, since it is larger than the sum of its proper divisors (6203653).

25140731 is a wasteful number, since it uses less digits than its factorization.

25140731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 326521.

The product of its (nonzero) digits is 840, while the sum is 23.

The square root of 25140731 is about 5014.0533503344. The cubic root of 25140731 is about 292.9494140907.

Adding to 25140731 its reverse (13704152), we get a palindrome (38844883).

The spelling of 25140731 in words is "twenty-five million, one hundred forty thousand, seven hundred thirty-one".