1631240 has 32 divisors (see below), whose sum is σ = 3953880. Its totient is φ = 602112.

The previous prime is 1631209. The next prime is 1631243. The reversal of 1631240 is 421361.

It can be written as a sum of positive squares in 4 ways, for example, as 1503076 + 128164 = 1226^2 + 358^2 .

It is not an unprimeable number, because it can be changed into a prime (1631243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1049 + ... + 2088.

2^1631240 is an apocalyptic number.

1631240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1631240 is an abundant number, since it is smaller than the sum of its proper divisors (2322640).

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

1631240 is a wasteful number, since it uses less digits than its factorization.

1631240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3161 (or 3157 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 1631240 is about 1277.2000626370. The cubic root of 1631240 is about 117.7170275946.

The spelling of 1631240 in words is "one million, six hundred thirty-one thousand, two hundred forty".