1287420545 has 16 divisors (see below), whose sum is σ = 1597681152. Its totient is φ = 994874880.

The previous prime is 1287420539. The next prime is 1287420571. The reversal of 1287420545 is 5450247821.

It is not a de Polignac number, because 1287420545 - 2⁴ = 1287420529 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1287420499 and 1287420508.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 79889 + ... + 94641.

It is an arithmetic number, because the mean of its divisors is an integer number (99855072).

Almost surely, 2^1287420545 is an apocalyptic number.

It is an amenable number.

1287420545 is a deficient number, since it is larger than the sum of its proper divisors (310260607).

1287420545 is a wasteful number, since it uses less digits than its factorization.

1287420545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15352.

The product of its (nonzero) digits is 89600, while the sum is 38.

The square root of 1287420545 is about 35880.6430405031. The cubic root of 1287420545 is about 1087.8611777829.

The spelling of 1287420545 in words is "one billion, two hundred eighty-seven million, four hundred twenty thousand, five hundred forty-five".