1994840 has 16 divisors (see below), whose sum is σ = 4488480. Its totient is φ = 797920.

The previous prime is 1994833. The next prime is 1994843. The reversal of 1994840 is 484991.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 1994840.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1994843) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24896 + ... + 24975.

It is an arithmetic number, because the mean of its divisors is an integer number (280530).

2^1994840 is an apocalyptic number.

1994840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1994840 is an abundant number, since it is smaller than the sum of its proper divisors (2493640).

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

1994840 is a wasteful number, since it uses less digits than its factorization.

1994840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49882 (or 49878 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 1994840 is about 1412.3880486608. The cubic root of 1994840 is about 125.8836584616.

The spelling of 1994840 in words is "one million, nine hundred ninety-four thousand, eight hundred forty".