1538617645 has 8 divisors (see below), whose sum is σ = 1846552320. Its totient is φ = 1230753360.

The previous prime is 1538617631. The next prime is 1538617687. The reversal of 1538617645 is 5467168351.

It is a happy number.

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

It is not a de Polignac number, because 1538617645 - 2¹⁹ = 1538093357 is a prime.

It is a super-3 number, since 3×1538617645³ (a number of 29 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1538617595 and 1538617604.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 71676 + ... + 90634.

It is an arithmetic number, because the mean of its divisors is an integer number (230819040).

Almost surely, 2^1538617645 is an apocalyptic number.

It is an amenable number.

1538617645 is a deficient number, since it is larger than the sum of its proper divisors (307934675).

1538617645 is a wasteful number, since it uses less digits than its factorization.

1538617645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35195.

The product of its digits is 604800, while the sum is 46.

The square root of 1538617645 is about 39225.2169528736. The cubic root of 1538617645 is about 1154.4547178413.

The spelling of 1538617645 in words is "one billion, five hundred thirty-eight million, six hundred seventeen thousand, six hundred forty-five".