1291438 has 8 divisors (see below), whose sum is σ = 1944288. Its totient is φ = 643344.

The previous prime is 1291421. The next prime is 1291447. The reversal of 1291438 is 8341921.

It is a happy number.

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, 406 + ... + 1657.

It is an arithmetic number, because the mean of its divisors is an integer number (243036).

2^1291438 is an apocalyptic number.

1291438 is a deficient number, since it is larger than the sum of its proper divisors (652850).

1291438 is a wasteful number, since it uses less digits than its factorization.

1291438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2378.

The product of its digits is 1728, while the sum is 28.

The square root of 1291438 is about 1136.4145370418. The cubic root of 1291438 is about 108.8991576383.

The spelling of 1291438 in words is "one million, two hundred ninety-one thousand, four hundred thirty-eight".