16140625 has 14 divisors (see below), whose sum is σ = 20195054. Its totient is φ = 12900000.

The previous prime is 16140613. The next prime is 16140637. The reversal of 16140625 is 52604161.

16140625 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (16140613) and next prime (16140637).

It can be written as a sum of positive squares in 7 ways, for example, as 15023376 + 1117249 = 3876^2 + 1057^2 .

It is not a de Polignac number, because 16140625 - 2²¹ = 14043473 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16140625.

It is an unprimeable number.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 15109 + ... + 16141.

Almost surely, 2^16140625 is an apocalyptic number.

It is an amenable number.

16140625 is a deficient number, since it is larger than the sum of its proper divisors (4054429).

16140625 is an frugal number, since it uses more digits than its factorization.

16140625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1063 (or 1038 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 16140625 is about 4017.5396699970. The cubic root of 16140625 is about 252.7202926704.

Adding to 16140625 its reverse (52604161), we get a palindrome (68744786).

It can be divided in two parts, 16 and 140625, that multiplied together give a square (2250000 = 1500²).

The spelling of 16140625 in words is "sixteen million, one hundred forty thousand, six hundred twenty-five".