1622990 has 16 divisors (see below), whose sum is σ = 3093552. Its totient is φ = 610944.

The previous prime is 1622987. The next prime is 1623023. The reversal of 1622990 is 992261.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 4604 + ... + 4943.

It is an arithmetic number, because the mean of its divisors is an integer number (193347).

2^1622990 is an apocalyptic number.

1622990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1622990 is a deficient number, since it is larger than the sum of its proper divisors (1470562).

1622990 is a wasteful number, since it uses less digits than its factorization.

1622990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9571.

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 1622990 is about 1273.9662475906. The cubic root of 1622990 is about 117.5182407173.

The spelling of 1622990 in words is "one million, six hundred twenty-two thousand, nine hundred ninety".