387400807 has 4 divisors (see below), whose sum is σ = 387440176. Its totient is φ = 387361440.

The previous prime is 387400789. The next prime is 387400817. The reversal of 387400807 is 708004783.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 708004783 = 349 ⋅2028667.

It is a cyclic number.

It is not a de Polignac number, because 387400807 - 2¹⁵ = 387368039 is a prime.

It is the 19683-rd Hogben number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (387400817) by changing a digit.

It is a nontrivial repunit in base 19682.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9478 + ... + 29404.

It is an arithmetic number, because the mean of its divisors is an integer number (96860044).

Almost surely, 2^387400807 is an apocalyptic number.

387400807 is a deficient number, since it is larger than the sum of its proper divisors (39369).

387400807 is a wasteful number, since it uses less digits than its factorization.

387400807 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39368.

The product of its (nonzero) digits is 37632, while the sum is 37.

The square root of 387400807 is about 19682.5000190525. The cubic root of 387400807 is about 728.9876547392.

The spelling of 387400807 in words is "three hundred eighty-seven million, four hundred thousand, eight hundred seven".