1622139 has 4 divisors (see below), whose sum is σ = 2162856. Its totient is φ = 1081424.

The previous prime is 1622081. The next prime is 1622141. The reversal of 1622139 is 9312261.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1622139 - 2¹³ = 1613947 is a prime.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (1622149) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 270354 + ... + 270359.

It is an arithmetic number, because the mean of its divisors is an integer number (540714).

2^1622139 is an apocalyptic number.

1622139 is a deficient number, since it is larger than the sum of its proper divisors (540717).

1622139 is an equidigital number, since it uses as much as digits as its factorization.

1622139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 540716.

The product of its digits is 648, while the sum is 24.

The square root of 1622139 is about 1273.6322075073. The cubic root of 1622139 is about 117.4976972538.

It can be divided in two parts, 16 and 22139, that added together give a triangular number (22155 = T₂₁₀).

The spelling of 1622139 in words is "one million, six hundred twenty-two thousand, one hundred thirty-nine".