420191387 has 16 divisors (see below), whose sum is σ = 524489472. Its totient is φ = 327037920.

The previous prime is 420191381. The next prime is 420191389. The reversal of 420191387 is 783191024.

It is not a de Polignac number, because 420191387 - 2¹⁰ = 420190363 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (420191381) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 75308 + ... + 80694.

It is an arithmetic number, because the mean of its divisors is an integer number (32780592).

Almost surely, 2^420191387 is an apocalyptic number.

420191387 is a deficient number, since it is larger than the sum of its proper divisors (104298085).

420191387 is a wasteful number, since it uses less digits than its factorization.

420191387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6418.

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 420191387 is about 20498.5703647840. The cubic root of 420191387 is about 749.0009732590. Note that the first 3 decimals are identical.

The spelling of 420191387 in words is "four hundred twenty million, one hundred ninety-one thousand, three hundred eighty-seven".