19860311940 has 48 divisors (see below), whose sum is σ = 63552999552. Its totient is φ = 4539499776.

The previous prime is 19860311923. The next prime is 19860311969. The reversal of 19860311940 is 4911306891.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 19860311892 and 19860311901.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23642809 + ... + 23643648.

It is an arithmetic number, because the mean of its divisors is an integer number (1324020824).

Almost surely, 2^19860311940 is an apocalyptic number.

19860311940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19860311940 is an abundant number, since it is smaller than the sum of its proper divisors (43692687612).

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

19860311940 is a wasteful number, since it uses less digits than its factorization.

19860311940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47286476 (or 47286474 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 42.

The spelling of 19860311940 in words is "nineteen billion, eight hundred sixty million, three hundred eleven thousand, nine hundred forty".