1939221 has 20 divisors (see below), whose sum is σ = 2940300. Its totient is φ = 1273536.

The previous prime is 1939187. The next prime is 1939229. The reversal of 1939221 is 1229391.

It can be written as a sum of positive squares in 2 ways, for example, as 236196 + 1703025 = 486^2 + 1305^2 .

It is not a de Polignac number, because 1939221 - 2¹⁰ = 1938197 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1939229) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 7075 + ... + 7343.

It is an arithmetic number, because the mean of its divisors is an integer number (147015).

2^1939221 is an apocalyptic number.

It is an amenable number.

1939221 is a deficient number, since it is larger than the sum of its proper divisors (1001079).

1939221 is an equidigital number, since it uses as much as digits as its factorization.

1939221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 370 (or 361 counting only the distinct ones).

The product of its digits is 972, while the sum is 27.

The square root of 1939221 is about 1392.5591549374. The cubic root of 1939221 is about 124.7026746753.

The spelling of 1939221 in words is "one million, nine hundred thirty-nine thousand, two hundred twenty-one".