1985147720 has 16 divisors (see below), whose sum is σ = 4466582460. Its totient is φ = 794059072.

The previous prime is 1985147719. The next prime is 1985147741. The reversal of 1985147720 is 277415891.

It can be written as a sum of positive squares in 2 ways, for example, as 1985058916 + 88804 = 44554^2 + 298^2 .

It is a super-2 number, since 2×1985147720² = 7881622940442396800, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24814307 + ... + 24814386.

Almost surely, 2^1985147720 is an apocalyptic number.

1985147720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1985147720 is an abundant number, since it is smaller than the sum of its proper divisors (2481434740).

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

1985147720 is a wasteful number, since it uses less digits than its factorization.

1985147720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49628704 (or 49628700 counting only the distinct ones).

The product of its (nonzero) digits is 141120, while the sum is 44.

The square root of 1985147720 is about 44554.9965772639. The cubic root of 1985147720 is about 1256.7945143433.

The spelling of 1985147720 in words is "one billion, nine hundred eighty-five million, one hundred forty-seven thousand, seven hundred twenty".