387420919 has 4 divisors (see below), whose sum is σ = 399918400. Its totient is φ = 374923440.

The previous prime is 387420883. The next prime is 387420923. The reversal of 387420919 is 919024783.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 919024783 = 277 ⋅3317779.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-387420919 is a prime.

It is a super-2 number, since 2×387420919² = 300189936957609122, which contains 22 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 (387420949) 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, 6248694 + ... + 6248755.

It is an arithmetic number, because the mean of its divisors is an integer number (99979600).

Almost surely, 2^387420919 is an apocalyptic number.

387420919 is a deficient number, since it is larger than the sum of its proper divisors (12497481).

387420919 is a wasteful number, since it uses less digits than its factorization.

387420919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12497480.

The product of its (nonzero) digits is 108864, while the sum is 43.

The square root of 387420919 is about 19683.0109231286. The cubic root of 387420919 is about 729.0002697069. Note that the first 3 decimals are identical.

The spelling of 387420919 in words is "three hundred eighty-seven million, four hundred twenty thousand, nine hundred nineteen".