387401869 has 4 divisors (see below), whose sum is σ = 387768060. Its totient is φ = 387035680.

The previous prime is 387401867. The next prime is 387401909. The reversal of 387401869 is 968104783.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 227708100 + 159693769 = 15090^2 + 12637^2 .

It is a cyclic number.

It is not a de Polignac number, because 387401869 - 2¹ = 387401867 is a prime.

It is a super-2 number, since 2×387401869² = 300160416209386322, 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 (387401867) 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, 181504 + ... + 183625.

It is an arithmetic number, because the mean of its divisors is an integer number (96942015).

Almost surely, 2^387401869 is an apocalyptic number.

It is an amenable number.

387401869 is a deficient number, since it is larger than the sum of its proper divisors (366191).

387401869 is a wasteful number, since it uses less digits than its factorization.

387401869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 366190.

The product of its (nonzero) digits is 290304, while the sum is 46.

The square root of 387401869 is about 19682.5269973141. The cubic root of 387401869 is about 728.9883208746.

The spelling of 387401869 in words is "three hundred eighty-seven million, four hundred one thousand, eight hundred sixty-nine".