387493421 has 6 divisors (see below), whose sum is σ = 450757710. Its totient is φ = 332137176.

The previous prime is 387493387. The next prime is 387493433. The reversal of 387493421 is 124394783.

It can be written as a sum of positive squares in only one way, i.e., 210975625 + 176517796 = 14525^2 + 13286^2 .

It is not a de Polignac number, because 387493421 - 2¹⁴ = 387477037 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (387493481) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3953966 + ... + 3954063.

It is an arithmetic number, because the mean of its divisors is an integer number (75126285).

Almost surely, 2^387493421 is an apocalyptic number.

It is an amenable number.

387493421 is a deficient number, since it is larger than the sum of its proper divisors (63264289).

387493421 is an equidigital number, since it uses as much as digits as its factorization.

387493421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7908043 (or 7908036 counting only the distinct ones).

The product of its digits is 145152, while the sum is 41.

The square root of 387493421 is about 19684.8525775531. The cubic root of 387493421 is about 729.0457419381.

The spelling of 387493421 in words is "three hundred eighty-seven million, four hundred ninety-three thousand, four hundred twenty-one".