1288055438 has 4 divisors (see below), whose sum is σ = 1932083160. Its totient is φ = 644027718.

The previous prime is 1288055423. The next prime is 1288055459. The reversal of 1288055438 is 8345508821.

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

It is a super-2 number, since 2×1288055438² = 3318173622722743688, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322013858 + ... + 322013861.

It is an arithmetic number, because the mean of its divisors is an integer number (483020790).

Almost surely, 2^1288055438 is an apocalyptic number.

1288055438 is a deficient number, since it is larger than the sum of its proper divisors (644027722).

1288055438 is an equidigital number, since it uses as much as digits as its factorization.

1288055438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 644027721.

The product of its (nonzero) digits is 307200, while the sum is 44.

The square root of 1288055438 is about 35889.4892412807. The cubic root of 1288055438 is about 1088.0399750802.

The spelling of 1288055438 in words is "one billion, two hundred eighty-eight million, fifty-five thousand, four hundred thirty-eight".