1288235925 has 72 divisors (see below), whose sum is σ = 2412119424. Its totient is φ = 656570880.

The previous prime is 1288235909. The next prime is 1288235933. The reversal of 1288235925 is 5295328821.

1288235925 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1288235925 - 2⁴ = 1288235909 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 453309 + ... + 456141.

Almost surely, 2^1288235925 is an apocalyptic number.

1288235925 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1288235925 is a deficient number, since it is larger than the sum of its proper divisors (1123883499).

1288235925 is a wasteful number, since it uses less digits than its factorization.

1288235925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2939 (or 2931 counting only the distinct ones).

The product of its digits is 345600, while the sum is 45.

The square root of 1288235925 is about 35892.0036359075. The cubic root of 1288235925 is about 1088.0907927426.

The spelling of 1288235925 in words is "one billion, two hundred eighty-eight million, two hundred thirty-five thousand, nine hundred twenty-five".