1820955 has 32 divisors (see below), whose sum is σ = 3184704. Its totient is φ = 884736.

The previous prime is 1820947. The next prime is 1820957. The reversal of 1820955 is 5590281.

It is not a de Polignac number, because 1820955 - 2³ = 1820947 is a prime.

It is a super-2 number, since 2×1820955² = 6631754224050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1820957) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9339 + ... + 9531.

It is an arithmetic number, because the mean of its divisors is an integer number (99522).

2^1820955 is an apocalyptic number.

1820955 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1820955 is a deficient number, since it is larger than the sum of its proper divisors (1363749).

1820955 is a wasteful number, since it uses less digits than its factorization.

1820955 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255.

The product of its (nonzero) digits is 3600, while the sum is 30.

The square root of 1820955 is about 1349.4276564529. The cubic root of 1820955 is about 122.1142663200.

It can be divided in two parts, 1820 and 955, that added together give a triangular number (2775 = T₇₄).

The spelling of 1820955 in words is "one million, eight hundred twenty thousand, nine hundred fifty-five".