1631040 has 56 divisors (see below), whose sum is σ = 5181600. Its totient is φ = 434688.

The previous prime is 1631029. The next prime is 1631051. The reversal of 1631040 is 401361.

It is an interprime number because it is at equal distance from previous prime (1631029) and next prime (1631051).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 111 + ... + 1809.

2^1631040 is an apocalyptic number.

1631040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1631040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2590800).

1631040 is an abundant number, since it is smaller than the sum of its proper divisors (3550560).

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

1631040 is a wasteful number, since it uses less digits than its factorization.

1631040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1719 (or 1709 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 1631040 is about 1277.1217639677. The cubic root of 1631040 is about 117.7122164555.

The spelling of 1631040 in words is "one million, six hundred thirty-one thousand, forty".