1288437987 has 8 divisors (see below), whose sum is σ = 1731444736. Its totient is φ = 852194952.

The previous prime is 1288437961. The next prime is 1288437991. The reversal of 1288437987 is 7897348821.

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

It is not a de Polignac number, because 1288437987 - 2⁷ = 1288437859 is a prime.

It is a super-2 number, since 2×1288437987² = 3320144892689224338, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1288437947) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1690483 + ... + 1691244.

It is an arithmetic number, because the mean of its divisors is an integer number (216430592).

Almost surely, 2^1288437987 is an apocalyptic number.

1288437987 is a deficient number, since it is larger than the sum of its proper divisors (443006749).

1288437987 is a wasteful number, since it uses less digits than its factorization.

1288437987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3381857.

The product of its digits is 5419008, while the sum is 57.

The square root of 1288437987 is about 35894.8183865025. The cubic root of 1288437987 is about 1088.1476794001.

The spelling of 1288437987 in words is "one billion, two hundred eighty-eight million, four hundred thirty-seven thousand, nine hundred eighty-seven".