1289390 has 8 divisors (see below), whose sum is σ = 2320920. Its totient is φ = 515752.

The previous prime is 1289381. The next prime is 1289401. The reversal of 1289390 is 939821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64460 + ... + 64479.

It is an arithmetic number, because the mean of its divisors is an integer number (290115).

2^1289390 is an apocalyptic number.

1289390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1289390 is a deficient number, since it is larger than the sum of its proper divisors (1031530).

1289390 is a wasteful number, since it uses less digits than its factorization.

1289390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128946.

The product of its (nonzero) digits is 3888, while the sum is 32.

The square root of 1289390 is about 1135.5130998804. The cubic root of 1289390 is about 108.8415620299.

The spelling of 1289390 in words is "one million, two hundred eighty-nine thousand, three hundred ninety".