391420489650 has 48 divisors (see below), whose sum is σ = 971426241408. Its totient is φ = 104303160000.

The previous prime is 391420489631. The next prime is 391420489667. The reversal of 391420489650 is 56984024193.

It is a junction number, because it is equal to n+sod(n) for n = 391420489593 and 391420489602.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 737626 + ... + 1151925.

It is an arithmetic number, because the mean of its divisors is an integer number (20238046696).

Almost surely, 2^391420489650 is an apocalyptic number.

391420489650 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

391420489650 is an abundant number, since it is smaller than the sum of its proper divisors (580005751758).

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

391420489650 is a wasteful number, since it uses less digits than its factorization.

391420489650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1890947 (or 1890942 counting only the distinct ones).

The product of its (nonzero) digits is 1866240, while the sum is 51.

The spelling of 391420489650 in words is "three hundred ninety-one billion, four hundred twenty million, four hundred eighty-nine thousand, six hundred fifty".