493866639 has 144 divisors (see below), whose sum is σ = 946108800. Its totient is φ = 255721536.

The previous prime is 493866631. The next prime is 493866641. The reversal of 493866639 is 936668394.

It is a happy number.

It is not a de Polignac number, because 493866639 - 2³ = 493866631 is a prime.

Its product of digits (5038848) is a multiple of the sum of its prime factors (144).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (493866631) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 8370592 + ... + 8370650.

It is an arithmetic number, because the mean of its divisors is an integer number (6570200).

Almost surely, 2^493866639 is an apocalyptic number.

493866639 is a gapful number since it is divisible by the number (49) formed by its first and last digit.

493866639 is a deficient number, since it is larger than the sum of its proper divisors (452242161).

493866639 is a wasteful number, since it uses less digits than its factorization.

493866639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144 (or 125 counting only the distinct ones).

The product of its digits is 5038848, while the sum is 54.

The square root of 493866639 is about 22223.1104708589. The cubic root of 493866639 is about 790.4417968950.

The spelling of 493866639 in words is "four hundred ninety-three million, eight hundred sixty-six thousand, six hundred thirty-nine".