386405880 has 128 divisors (see below), whose sum is σ = 1332979200. Its totient is φ = 87777792.

The previous prime is 386405867. The next prime is 386405893. The reversal of 386405880 is 88504683.

It is an interprime number because it is at equal distance from previous prime (386405867) and next prime (386405893).

It is a super-3 number, since 3×386405880³ (a number of 27 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 143991 + ... + 146649.

It is an arithmetic number, because the mean of its divisors is an integer number (10413900).

Almost surely, 2^386405880 is an apocalyptic number.

386405880 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 386405880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (666489600).

386405880 is an abundant number, since it is smaller than the sum of its proper divisors (946573320).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

386405880 is a wasteful number, since it uses less digits than its factorization.

386405880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2853 (or 2849 counting only the distinct ones).

The product of its (nonzero) digits is 184320, while the sum is 42.

The square root of 386405880 is about 19657.2093645054. The cubic root of 386405880 is about 728.3630550365.

The spelling of 386405880 in words is "three hundred eighty-six million, four hundred five thousand, eight hundred eighty".