1993904450 has 12 divisors (see below), whose sum is σ = 3708662370. Its totient is φ = 797561760.

The previous prime is 1993904417. The next prime is 1993904501. The reversal of 1993904450 is 544093991.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 959574529 + 1034329921 = 30977^2 + 32161^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 19938995 + ... + 19939094.

Almost surely, 2^1993904450 is an apocalyptic number.

1993904450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1993904450 is a deficient number, since it is larger than the sum of its proper divisors (1714757920).

1993904450 is a wasteful number, since it uses less digits than its factorization.

1993904450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39878101 (or 39878096 counting only the distinct ones).

The product of its (nonzero) digits is 174960, while the sum is 44.

The square root of 1993904450 is about 44653.1572232020. The cubic root of 1993904450 is about 1258.6397620269.

The spelling of 1993904450 in words is "one billion, nine hundred ninety-three million, nine hundred four thousand, four hundred fifty".