1289139446 has 16 divisors (see below), whose sum is σ = 2211852960. Its totient is φ = 552013440.

The previous prime is 1289139437. The next prime is 1289139479. The reversal of 1289139446 is 6449319821.

It is a super-2 number, since 2×1289139446² = 3323761022466373832, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1289139446.

It is a congruent number.

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, 22451 + ... + 55518.

It is an arithmetic number, because the mean of its divisors is an integer number (138240810).

Almost surely, 2^1289139446 is an apocalyptic number.

1289139446 is a deficient number, since it is larger than the sum of its proper divisors (922713514).

1289139446 is a wasteful number, since it uses less digits than its factorization.

1289139446 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79159.

The product of its digits is 373248, while the sum is 47.

The square root of 1289139446 is about 35904.5880912175. The cubic root of 1289139446 is about 1088.3451154983.

The spelling of 1289139446 in words is "one billion, two hundred eighty-nine million, one hundred thirty-nine thousand, four hundred forty-six".