15540625 has 12 divisors (see below), whose sum is σ = 19428444. Its totient is φ = 12430000.

The previous prime is 15540619. The next prime is 15540631. The reversal of 15540625 is 52604551.

It is an interprime number because it is at equal distance from previous prime (15540619) and next prime (15540631).

It can be written as a sum of positive squares in 6 ways, for example, as 11888704 + 3651921 = 3448^2 + 1911^2 .

It is not a de Polignac number, because 15540625 - 2⁵ = 15540593 is a prime.

It is a super-2 number, since 2×15540625² = 483022050781250, which contains 22 as substring.

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 15540593 and 15540602.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 639 + ... + 5611.

It is an arithmetic number, because the mean of its divisors is an integer number (1619037).

Almost surely, 2^15540625 is an apocalyptic number.

It is an amenable number.

15540625 is a deficient number, since it is larger than the sum of its proper divisors (3887819).

15540625 is an frugal number, since it uses more digits than its factorization.

15540625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4998 (or 4978 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 28.

The square root of 15540625 is about 3942.1599409461. The cubic root of 15540625 is about 249.5491875612.

The spelling of 15540625 in words is "fifteen million, five hundred forty thousand, six hundred twenty-five".