491640140 has 24 divisors (see below), whose sum is σ = 1041920880. Its totient is φ = 194851008.

The previous prime is 491640133. The next prime is 491640179. The reversal of 491640140 is 41046194.

It is a happy 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, 110582 + ... + 114941.

It is an arithmetic number, because the mean of its divisors is an integer number (43413370).

Almost surely, 2^491640140 is an apocalyptic number.

It is an amenable number.

491640140 is an abundant number, since it is smaller than the sum of its proper divisors (550280740).

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

491640140 is a wasteful number, since it uses less digits than its factorization.

491640140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225641 (or 225639 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 491640140 is about 22172.9596581061. The cubic root of 491640140 is about 789.2521577488.

The spelling of 491640140 in words is "four hundred ninety-one million, six hundred forty thousand, one hundred forty".