1921955 has 16 divisors (see below), whose sum is σ = 2669760. Its totient is φ = 1300992.

The previous prime is 1921937. The next prime is 1921967. The reversal of 1921955 is 5591291.

It is not a de Polignac number, because 1921955 - 2¹² = 1917859 is a prime.

It is a super-2 number, since 2×1921955² = 7387822044050, which contains 22 as substring.

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, 2807 + ... + 3423.

It is an arithmetic number, because the mean of its divisors is an integer number (166860).

2^1921955 is an apocalyptic number.

1921955 is a deficient number, since it is larger than the sum of its proper divisors (747805).

1921955 is an equidigital number, since it uses as much as digits as its factorization.

1921955 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 718.

The product of its digits is 4050, while the sum is 32.

The square root of 1921955 is about 1386.3459164292. The cubic root of 1921955 is about 124.3314709251.

The spelling of 1921955 in words is "one million, nine hundred twenty-one thousand, nine hundred fifty-five".