1377021 has 4 divisors (see below), whose sum is σ = 1836032. Its totient is φ = 918012.

The previous prime is 1376981. The next prime is 1377023. The reversal of 1377021 is 1207731.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1377021 - 2⁶ = 1376957 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1377023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 229501 + ... + 229506.

It is an arithmetic number, because the mean of its divisors is an integer number (459008).

2^1377021 is an apocalyptic number.

It is an amenable number.

1377021 is a deficient number, since it is larger than the sum of its proper divisors (459011).

1377021 is an equidigital number, since it uses as much as digits as its factorization.

1377021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 459010.

The product of its (nonzero) digits is 294, while the sum is 21.

The square root of 1377021 is about 1173.4653808272. The cubic root of 1377021 is about 111.2534586308.

The spelling of 1377021 in words is "one million, three hundred seventy-seven thousand, twenty-one".