40390625 has 32 divisors (see below), whose sum is σ = 56249856. Its totient is φ = 28750000.

The previous prime is 40390621. The next prime is 40390627. The reversal of 40390625 is 52609304.

40390625 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 40390625 - 2² = 40390621 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40390621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 859352 + ... + 859398.

It is an arithmetic number, because the mean of its divisors is an integer number (1757808).

Almost surely, 2^40390625 is an apocalyptic number.

It is an amenable number.

40390625 is a deficient number, since it is larger than the sum of its proper divisors (15859231).

40390625 is an frugal number, since it uses more digits than its factorization.

40390625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93 (or 63 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 29.

The square root of 40390625 is about 6355.3619094431. The cubic root of 40390625 is about 343.1048505481.

Adding to 40390625 its reverse (52609304), we get a palindrome (92999929).

It can be divided in two parts, 40 and 390625, that multiplied together give a cube (15625000 = 250³).

The spelling of 40390625 in words is "forty million, three hundred ninety thousand, six hundred twenty-five".