1021955 has 16 divisors (see below), whose sum is σ = 1417824. Its totient is φ = 698880.

The previous prime is 1021919. The next prime is 1021961. The reversal of 1021955 is 5591201.

It is not a de Polignac number, because 1021955 - 2¹⁰ = 1020931 is a prime.

It is a Duffinian number.

It is a zygodrome in base 2.

It is a self number, because there is not a number n which added to its sum of digits gives 1021955.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 389 + ... + 1481.

It is an arithmetic number, because the mean of its divisors is an integer number (88614).

2^1021955 is an apocalyptic number.

1021955 is a deficient number, since it is larger than the sum of its proper divisors (395869).

1021955 is a wasteful number, since it uses less digits than its factorization.

1021955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1126.

The product of its (nonzero) digits is 450, while the sum is 23.

The square root of 1021955 is about 1010.9178997327. The cubic root of 1021955 is about 100.7265419179.

The spelling of 1021955 in words is "one million, twenty-one thousand, nine hundred fifty-five".