1409640 has 64 divisors (see below), whose sum is σ = 4484160. Its totient is φ = 353280.

The previous prime is 1409633. The next prime is 1409651. The reversal of 1409640 is 469041.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 1409640.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1695 + ... + 2385.

It is an arithmetic number, because the mean of its divisors is an integer number (70065).

2^1409640 is an apocalyptic number.

1409640 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 1409640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2242080).

1409640 is an abundant number, since it is smaller than the sum of its proper divisors (3074520).

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

1409640 is a wasteful number, since it uses less digits than its factorization.

1409640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 722 (or 718 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 1409640 is about 1187.2826116810. The cubic root of 1409640 is about 112.1250728614.

The spelling of 1409640 in words is "one million, four hundred nine thousand, six hundred forty".