1290139 has 4 divisors (see below), whose sum is σ = 1346256. Its totient is φ = 1234024.

The previous prime is 1290131. The next prime is 1290143. The reversal of 1290139 is 9310921.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1290139 - 2³ = 1290131 is a prime.

It is an Ulam number.

It is a Duffinian number.

1290139 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1290131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28024 + ... + 28069.

It is an arithmetic number, because the mean of its divisors is an integer number (336564).

2^1290139 is an apocalyptic number.

1290139 is a deficient number, since it is larger than the sum of its proper divisors (56117).

1290139 is an equidigital number, since it uses as much as digits as its factorization.

1290139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56116.

The product of its (nonzero) digits is 486, while the sum is 25.

The square root of 1290139 is about 1135.8428588498. The cubic root of 1290139 is about 108.8626331177.

The spelling of 1290139 in words is "one million, two hundred ninety thousand, one hundred thirty-nine".