1820745 has 16 divisors (see below), whose sum is σ = 3237120. Its totient is φ = 970992.

The previous prime is 1820743. The next prime is 1820747. The reversal of 1820745 is 5470281.

It is an interprime number because it is at equal distance from previous prime (1820743) and next prime (1820747).

It is not a de Polignac number, because 1820745 - 2¹ = 1820743 is a prime.

It is a super-2 number, since 2×1820745² = 6630224710050, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (1820743) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6609 + ... + 6878.

It is an arithmetic number, because the mean of its divisors is an integer number (202320).

2^1820745 is an apocalyptic number.

1820745 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1820745 is a deficient number, since it is larger than the sum of its proper divisors (1416375).

1820745 is a wasteful number, since it uses less digits than its factorization.

1820745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13501 (or 13495 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

The square root of 1820745 is about 1349.3498434431. The cubic root of 1820745 is about 122.1095719002.

The spelling of 1820745 in words is "one million, eight hundred twenty thousand, seven hundred forty-five".