1631380 has 12 divisors (see below), whose sum is σ = 3425940. Its totient is φ = 652544.

The previous prime is 1631369. The next prime is 1631407. The reversal of 1631380 is 831361.

It can be written as a sum of positive squares in 2 ways, for example, as 234256 + 1397124 = 484^2 + 1182^2 .

It is a super-2 number, since 2×1631380² = 5322801408800, which contains 22 as substring.

It is a plaindrome in base 15.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40765 + ... + 40804.

It is an arithmetic number, because the mean of its divisors is an integer number (285495).

2^1631380 is an apocalyptic number.

1631380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1631380 is an abundant number, since it is smaller than the sum of its proper divisors (1794560).

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

1631380 is a wasteful number, since it uses less digits than its factorization.

1631380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81578 (or 81576 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 1631380 is about 1277.2548688496. The cubic root of 1631380 is about 117.7203951580.

The spelling of 1631380 in words is "one million, six hundred thirty-one thousand, three hundred eighty".