491761400 has 48 divisors (see below), whose sum is σ = 1231301400. Its totient is φ = 181572480.

The previous prime is 491761357. The next prime is 491761409. The reversal of 491761400 is 4167194.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491761409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 91970 + ... + 97169.

Almost surely, 2^491761400 is an apocalyptic number.

491761400 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

491761400 is an abundant number, since it is smaller than the sum of its proper divisors (739540000).

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

491761400 is a wasteful number, since it uses less digits than its factorization.

491761400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189168 (or 189159 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 491761400 is about 22175.6939012063. The cubic root of 491761400 is about 789.3170404693.

The spelling of 491761400 in words is "four hundred ninety-one million, seven hundred sixty-one thousand, four hundred".