387492993 has 6 divisors (see below), whose sum is σ = 559712114. Its totient is φ = 258328656.

The previous prime is 387492991. The next prime is 387492997. The reversal of 387492993 is 399294783.

It can be written as a sum of positive squares in only one way, i.e., 300779649 + 86713344 = 17343^2 + 9312^2 .

It is not a de Polignac number, because 387492993 - 2¹ = 387492991 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (387492991) 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, 21527380 + ... + 21527397.

Almost surely, 2^387492993 is an apocalyptic number.

It is an amenable number.

387492993 is a deficient number, since it is larger than the sum of its proper divisors (172219121).

387492993 is a wasteful number, since it uses less digits than its factorization.

387492993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43054783 (or 43054780 counting only the distinct ones).

The product of its digits is 2939328, while the sum is 54.

The square root of 387492993 is about 19684.8417062470. The cubic root of 387492993 is about 729.0454735192.

The spelling of 387492993 in words is "three hundred eighty-seven million, four hundred ninety-two thousand, nine hundred ninety-three".