1549399985 has 32 divisors (see below), whose sum is σ = 2161396224. Its totient is φ = 1044288000.

The previous prime is 1549399981. The next prime is 1549400029. The reversal of 1549399985 is 5899939451.

It is a happy number.

It is not a de Polignac number, because 1549399985 - 2² = 1549399981 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1549399981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1045445 + ... + 1046925.

It is an arithmetic number, because the mean of its divisors is an integer number (67543632).

Almost surely, 2^1549399985 is an apocalyptic number.

It is an amenable number.

1549399985 is a deficient number, since it is larger than the sum of its proper divisors (611996239).

1549399985 is a wasteful number, since it uses less digits than its factorization.

1549399985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1985.

The product of its digits is 15746400, while the sum is 62.

The square root of 1549399985 is about 39362.4184343391. The cubic root of 1549399985 is about 1157.1451759304.

The spelling of 1549399985 in words is "one billion, five hundred forty-nine million, three hundred ninety-nine thousand, nine hundred eighty-five".