1642740 has 96 divisors (see below), whose sum is σ = 5322240. Its totient is φ = 374400.

The previous prime is 1642723. The next prime is 1642741. The reversal of 1642740 is 472461.

It is a self number, because there is not a number n which added to its sum of digits gives 1642740.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1642741) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12475 + ... + 12605.

It is an arithmetic number, because the mean of its divisors is an integer number (55440).

2^1642740 is an apocalyptic number.

1642740 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 1642740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2661120).

1642740 is an abundant number, since it is smaller than the sum of its proper divisors (3679500).

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

1642740 is a wasteful number, since it uses less digits than its factorization.

1642740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173 (or 171 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 24.

The square root of 1642740 is about 1281.6941912953. The cubic root of 1642740 is about 117.9930092574.

The spelling of 1642740 in words is "one million, six hundred forty-two thousand, seven hundred forty".