40239725 has 6 divisors (see below), whose sum is σ = 49897290. Its totient is φ = 32191760.

The previous prime is 40239721. The next prime is 40239751. The reversal of 40239725 is 52793204.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 8305924 + 31933801 = 2882^2 + 5651^2 .

It is not a de Polignac number, because 40239725 - 2² = 40239721 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 40239691 and 40239700.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40239721) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 804770 + ... + 804819.

It is an arithmetic number, because the mean of its divisors is an integer number (8316215).

Almost surely, 2^40239725 is an apocalyptic number.

It is an amenable number.

40239725 is a deficient number, since it is larger than the sum of its proper divisors (9657565).

40239725 is a wasteful number, since it uses less digits than its factorization.

40239725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1609599 (or 1609594 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 32.

The square root of 40239725 is about 6343.4789350955. The cubic root of 40239725 is about 342.6770356536.

The spelling of 40239725 in words is "forty million, two hundred thirty-nine thousand, seven hundred twenty-five".