1280102387 has 4 divisors (see below), whose sum is σ = 1307338656. Its totient is φ = 1252866120.

The previous prime is 1280102321. The next prime is 1280102401. The reversal of 1280102387 is 7832010821.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1280102387 - 2¹² = 1280098291 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1280122387) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13618064 + ... + 13618157.

It is an arithmetic number, because the mean of its divisors is an integer number (326834664).

Almost surely, 2^1280102387 is an apocalyptic number.

1280102387 is a deficient number, since it is larger than the sum of its proper divisors (27236269).

1280102387 is an equidigital number, since it uses as much as digits as its factorization.

1280102387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27236268.

The product of its (nonzero) digits is 5376, while the sum is 32.

The square root of 1280102387 is about 35778.5185132085. The cubic root of 1280102387 is about 1085.7959959782.

The spelling of 1280102387 in words is "one billion, two hundred eighty million, one hundred two thousand, three hundred eighty-seven".