1288440901 has 16 divisors (see below), whose sum is σ = 1490227200. Its totient is φ = 1101654000.

The previous prime is 1288440889. The next prime is 1288440911. The reversal of 1288440901 is 1090448821.

It is a cyclic number.

It is not a de Polignac number, because 1288440901 - 2⁷ = 1288440773 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1288440911) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6876 + ... + 51226.

It is an arithmetic number, because the mean of its divisors is an integer number (93139200).

Almost surely, 2^1288440901 is an apocalyptic number.

1288440901 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1288440901 is a deficient number, since it is larger than the sum of its proper divisors (201786299).

1288440901 is a wasteful number, since it uses less digits than its factorization.

1288440901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44520.

The product of its (nonzero) digits is 18432, while the sum is 37.

The square root of 1288440901 is about 35894.8589772965. The cubic root of 1288440901 is about 1088.1484997371.

The spelling of 1288440901 in words is "one billion, two hundred eighty-eight million, four hundred forty thousand, nine hundred one".