387778362421 has 4 divisors (see below), whose sum is σ = 388071912844. Its totient is φ = 387484812000.

The previous prime is 387778362371. The next prime is 387778362431. The reversal of 387778362421 is 124263877783.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 234125338225 + 153653024196 = 483865^2 + 391986^2 .

It is a cyclic number.

It is not a de Polignac number, because 387778362421 - 2¹¹ = 387778360373 is a prime.

It is a super-3 number, since 3×387778362421³ (a number of 36 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (387778362431) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 146773230 + ... + 146775871.

It is an arithmetic number, because the mean of its divisors is an integer number (97017978211).

Almost surely, 2^387778362421 is an apocalyptic number.

It is an amenable number.

387778362421 is a deficient number, since it is larger than the sum of its proper divisors (293550423).

387778362421 is a wasteful number, since it uses less digits than its factorization.

387778362421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 293550422.

The product of its digits is 18966528, while the sum is 58.

The spelling of 387778362421 in words is "three hundred eighty-seven billion, seven hundred seventy-eight million, three hundred sixty-two thousand, four hundred twenty-one".