1289390532 has 24 divisors (see below), whose sum is σ = 3049793376. Its totient is φ = 423908928.

The previous prime is 1289390507. The next prime is 1289390563. The reversal of 1289390532 is 2350939821.

It is a super-2 number, since 2×1289390532² = 3325055888022486048, 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, 735078 + ... + 736829.

It is an arithmetic number, because the mean of its divisors is an integer number (127074724).

Almost surely, 2^1289390532 is an apocalyptic number.

1289390532 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1289390532 is an abundant number, since it is smaller than the sum of its proper divisors (1760402844).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1289390532 is a wasteful number, since it uses less digits than its factorization.

1289390532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1471987 (or 1471985 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 42.

The square root of 1289390532 is about 35908.0844936067. The cubic root of 1289390532 is about 1088.4157699913.

The spelling of 1289390532 in words is "one billion, two hundred eighty-nine million, three hundred ninety thousand, five hundred thirty-two".