1642940 has 48 divisors (see below), whose sum is σ = 3810240. Its totient is φ = 591360.

The previous prime is 1642939. The next prime is 1642943. The reversal of 1642940 is 492461.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1642943) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18416 + ... + 18504.

It is an arithmetic number, because the mean of its divisors is an integer number (79380).

2^1642940 is an apocalyptic number.

1642940 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 1642940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1905120).

1642940 is an abundant number, since it is smaller than the sum of its proper divisors (2167300).

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

1642940 is a wasteful number, since it uses less digits than its factorization.

1642940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182 (or 180 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 1642940 is about 1281.7722106521. The cubic root of 1642940 is about 117.9977975266.

1642940 divided by its sum of digits (26) gives a triangular number (63190 = T₃₅₅).

The spelling of 1642940 in words is "one million, six hundred forty-two thousand, nine hundred forty".