1994457040 has 40 divisors (see below), whose sum is σ = 4640515488. Its totient is φ = 797197440.

The previous prime is 1994457019. The next prime is 1994457041. The reversal of 1994457040 is 407544991.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1994457041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 110235 + ... + 127045.

Almost surely, 2^1994457040 is an apocalyptic number.

1994457040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1994457040 is an abundant number, since it is smaller than the sum of its proper divisors (2646058448).

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

1994457040 is a wasteful number, since it uses less digits than its factorization.

1994457040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18307 (or 18301 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 43.

The square root of 1994457040 is about 44659.3443749458. The cubic root of 1994457040 is about 1258.7560242856.

The spelling of 1994457040 in words is "one billion, nine hundred ninety-four million, four hundred fifty-seven thousand, forty".