1290381 has 8 divisors (see below), whose sum is σ = 1726080. Its totient is φ = 857472.

The previous prime is 1290379. The next prime is 1290427. The reversal of 1290381 is 1830921.

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

It is not a de Polignac number, because 1290381 - 2¹ = 1290379 is a prime.

It is a super-2 number, since 2×1290381² = 3330166250322, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1290371) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 925 + ... + 1853.

It is an arithmetic number, because the mean of its divisors is an integer number (215760).

2^1290381 is an apocalyptic number.

It is an amenable number.

1290381 is a deficient number, since it is larger than the sum of its proper divisors (435699).

1290381 is an equidigital number, since it uses as much as digits as its factorization.

1290381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1395.

The product of its (nonzero) digits is 432, while the sum is 24.

The square root of 1290381 is about 1135.9493826751. The cubic root of 1290381 is about 108.8694393895.

The spelling of 1290381 in words is "one million, two hundred ninety thousand, three hundred eighty-one".