1385021 has 16 divisors (see below), whose sum is σ = 1608768. Its totient is φ = 1180800.

The previous prime is 1385017. The next prime is 1385023. The reversal of 1385021 is 1205831.

It is not a de Polignac number, because 1385021 - 2² = 1385017 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a nialpdrome in base 11.

It is a junction number, because it is equal to n+sod(n) for n = 1384984 and 1385002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1385023) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16646 + ... + 16728.

It is an arithmetic number, because the mean of its divisors is an integer number (100548).

2^1385021 is an apocalyptic number.

1385021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1385021 is a deficient number, since it is larger than the sum of its proper divisors (223747).

1385021 is a wasteful number, since it uses less digits than its factorization.

1385021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172.

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 1385021 is about 1176.8691516052. The cubic root of 1385021 is about 111.4684903623.

The spelling of 1385021 in words is "one million, three hundred eighty-five thousand, twenty-one".