387199421 has 6 divisors (see below), whose sum is σ = 450415710. Its totient is φ = 331885176.

The previous prime is 387199409. The next prime is 387199427. The reversal of 387199421 is 124991783.

It can be written as a sum of positive squares in only one way, i.e., 386908900 + 290521 = 19670^2 + 539^2 .

It is not a de Polignac number, because 387199421 - 2¹⁴ = 387183037 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (387199427) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3950966 + ... + 3951063.

It is an arithmetic number, because the mean of its divisors is an integer number (75069285).

Almost surely, 2^387199421 is an apocalyptic number.

It is an amenable number.

387199421 is a deficient number, since it is larger than the sum of its proper divisors (63216289).

387199421 is an equidigital number, since it uses as much as digits as its factorization.

387199421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7902043 (or 7902036 counting only the distinct ones).

The product of its digits is 108864, while the sum is 44.

The square root of 387199421 is about 19677.3834896818. The cubic root of 387199421 is about 728.8613141367.

The spelling of 387199421 in words is "three hundred eighty-seven million, one hundred ninety-nine thousand, four hundred twenty-one".