1622988 has 18 divisors (see below), whose sum is σ = 4102644. Its totient is φ = 540984.

The previous prime is 1622987. The next prime is 1623023. The reversal of 1622988 is 8892261.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 45083 = 1622988 / (1 + 6 + 2 + 2 + 9 + 8 + 8).

It is a zygodrome in base 2.

It is not an unprimeable number, because it can be changed into a prime (1622981) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 22506 + ... + 22577.

2^1622988 is an apocalyptic number.

1622988 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1622988 is an abundant number, since it is smaller than the sum of its proper divisors (2479656).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1622988 is a wasteful number, since it uses less digits than its factorization.

1622988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45093 (or 45088 counting only the distinct ones).

The product of its digits is 13824, while the sum is 36.

The square root of 1622988 is about 1273.9654626402. The cubic root of 1622988 is about 117.5181924449.

The spelling of 1622988 in words is "one million, six hundred twenty-two thousand, nine hundred eighty-eight".