1287621385 has 8 divisors (see below), whose sum is σ = 1545347520. Its totient is φ = 1029962544.

The previous prime is 1287621371. The next prime is 1287621403. The reversal of 1287621385 is 5831267821.

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

It is a cyclic number.

It is not a de Polignac number, because 1287621385 - 2²³ = 1279232777 is a prime.

It is a super-2 number, since 2×1287621385² = 3315937662218636450, which contains 22 as substring.

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, 47964 + ... + 69826.

It is an arithmetic number, because the mean of its divisors is an integer number (193168440).

Almost surely, 2^1287621385 is an apocalyptic number.

It is an amenable number.

1287621385 is a deficient number, since it is larger than the sum of its proper divisors (257726135).

1287621385 is a wasteful number, since it uses less digits than its factorization.

1287621385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33647.

The product of its digits is 161280, while the sum is 43.

The square root of 1287621385 is about 35883.4416548915. The cubic root of 1287621385 is about 1087.9177442973.

The spelling of 1287621385 in words is "one billion, two hundred eighty-seven million, six hundred twenty-one thousand, three hundred eighty-five".