1617880385 has 32 divisors (see below), whose sum is σ = 2187762048. Its totient is φ = 1138475520.

The previous prime is 1617880379. The next prime is 1617880403. The reversal of 1617880385 is 5830887161.

It is a happy number.

It is not a de Polignac number, because 1617880385 - 2⁶ = 1617880321 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 208994 + ... + 216596.

It is an arithmetic number, because the mean of its divisors is an integer number (68367564).

Almost surely, 2^1617880385 is an apocalyptic number.

It is an amenable number.

1617880385 is a deficient number, since it is larger than the sum of its proper divisors (569881663).

1617880385 is a wasteful number, since it uses less digits than its factorization.

1617880385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7745.

The product of its (nonzero) digits is 322560, while the sum is 47.

The square root of 1617880385 is about 40222.8838473822. The cubic root of 1617880385 is about 1173.9478458161.

The spelling of 1617880385 in words is "one billion, six hundred seventeen million, eight hundred eighty thousand, three hundred eighty-five".