1864493720 has 32 divisors (see below), whose sum is σ = 4196344320. Its totient is φ = 745578240.

The previous prime is 1864493681. The next prime is 1864493749. The reversal of 1864493720 is 273944681.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 247124 + ... + 254556.

It is an arithmetic number, because the mean of its divisors is an integer number (131135760).

Almost surely, 2^1864493720 is an apocalyptic number.

1864493720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1864493720 is an abundant number, since it is smaller than the sum of its proper divisors (2331850600).

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

1864493720 is a wasteful number, since it uses less digits than its factorization.

1864493720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13715 (or 13711 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 44.

The square root of 1864493720 is about 43179.7836956139. The cubic root of 1864493720 is about 1230.7985472624.

The spelling of 1864493720 in words is "one billion, eight hundred sixty-four million, four hundred ninety-three thousand, seven hundred twenty".