1993486540 has 24 divisors (see below), whose sum is σ = 4187160432. Its totient is φ = 797234880.

The previous prime is 1993486501. The next prime is 1993486541. The reversal of 1993486540 is 456843991.

It is a happy number.

It is a super-2 number, since 2×1993486540² = 7947977170322343200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1993486541) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 193110 + ... + 203170.

It is an arithmetic number, because the mean of its divisors is an integer number (174465018).

Almost surely, 2^1993486540 is an apocalyptic number.

1993486540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1993486540 is an abundant number, since it is smaller than the sum of its proper divisors (2193673892).

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

1993486540 is a wasteful number, since it uses less digits than its factorization.

1993486540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19977 (or 19975 counting only the distinct ones).

The product of its (nonzero) digits is 933120, while the sum is 49.

The square root of 1993486540 is about 44648.4774656427. The cubic root of 1993486540 is about 1258.5518215214.

The spelling of 1993486540 in words is "one billion, nine hundred ninety-three million, four hundred eighty-six thousand, five hundred forty".