1791940 has 12 divisors (see below), whose sum is σ = 3763116. Its totient is φ = 716768.

The previous prime is 1791901. The next prime is 1791941. The reversal of 1791940 is 491971.

It can be written as a sum of positive squares in 2 ways, for example, as 1364224 + 427716 = 1168^2 + 654^2 .

It is a super-2 number, since 2×1791940² = 6422097927200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1791941) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44779 + ... + 44818.

It is an arithmetic number, because the mean of its divisors is an integer number (313593).

2^1791940 is an apocalyptic number.

1791940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1791940 is an abundant number, since it is smaller than the sum of its proper divisors (1971176).

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

1791940 is a wasteful number, since it uses less digits than its factorization.

1791940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89606 (or 89604 counting only the distinct ones).

The product of its (nonzero) digits is 2268, while the sum is 31.

The square root of 1791940 is about 1338.6336317305. The cubic root of 1791940 is about 121.4622032398.

Adding to 1791940 its sum of digits (31), we get a palindrome (1791971).

The spelling of 1791940 in words is "one million, seven hundred ninety-one thousand, nine hundred forty".