1620954 has 12 divisors (see below), whose sum is σ = 3512106. Its totient is φ = 540312.

The previous prime is 1620929. The next prime is 1620961. The reversal of 1620954 is 4590261.

It can be written as a sum of positive squares in only one way, i.e., 1375929 + 245025 = 1173^2 + 495^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 45009 + ... + 45044.

2^1620954 is an apocalyptic number.

1620954 is an abundant number, since it is smaller than the sum of its proper divisors (1891152).

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

1620954 is a wasteful number, since it uses less digits than its factorization.

1620954 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90061 (or 90058 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 1620954 is about 1273.1669175721. The cubic root of 1620954 is about 117.4690789316.

The spelling of 1620954 in words is "one million, six hundred twenty thousand, nine hundred fifty-four".