1381021 has 8 divisors (see below), whose sum is σ = 1430784. Its totient is φ = 1332240.

The previous prime is 1380997. The next prime is 1381027. The reversal of 1381021 is 1201831.

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

It is a cyclic number.

It is not a de Polignac number, because 1381021 - 2¹³ = 1372829 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1380986 and 1381004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1381027) 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, 3580 + ... + 3946.

It is an arithmetic number, because the mean of its divisors is an integer number (178848).

2^1381021 is an apocalyptic number.

It is an amenable number.

1381021 is a deficient number, since it is larger than the sum of its proper divisors (49763).

1381021 is an equidigital number, since it uses as much as digits as its factorization.

1381021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 491.

The product of its (nonzero) digits is 48, while the sum is 16.

The square root of 1381021 is about 1175.1684985567. The cubic root of 1381021 is about 111.3610783000.

Adding to 1381021 its reverse (1201831), we get a palindrome (2582852).

It can be divided in two parts, 13810 and 21, that added together give a palindrome (13831).

The spelling of 1381021 in words is "one million, three hundred eighty-one thousand, twenty-one".