387740393990 has 32 divisors (see below), whose sum is σ = 739887947424. Its totient is φ = 145795002880.

The previous prime is 387740393951. The next prime is 387740394001. The reversal of 387740393990 is 99393047783.

It is a super-2 number, since 2×387740393990² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1249484 + ... + 1528623.

It is an arithmetic number, because the mean of its divisors is an integer number (23121498357).

Almost surely, 2^387740393990 is an apocalyptic number.

387740393990 is a deficient number, since it is larger than the sum of its proper divisors (352147553434).

387740393990 is a wasteful number, since it uses less digits than its factorization.

387740393990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2778952.

The product of its (nonzero) digits is 30862944, while the sum is 62.

The spelling of 387740393990 in words is "three hundred eighty-seven billion, seven hundred forty million, three hundred ninety-three thousand, nine hundred ninety".