6403890 has 32 divisors (see below), whose sum is σ = 16039296. Its totient is φ = 1633280.

The previous prime is 6403889. The next prime is 6403907. The reversal of 6403890 is 983046.

6403890 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3951 + ... + 5330.

It is an arithmetic number, because the mean of its divisors is an integer number (501228).

Almost surely, 2^6403890 is an apocalyptic number.

6403890 is an abundant number, since it is smaller than the sum of its proper divisors (9635406).

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

6403890 is a wasteful number, since it uses less digits than its factorization.

6403890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9314.

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 6403890 is about 2530.5908401004. The cubic root of 6403890 is about 185.7011619354.

The spelling of 6403890 in words is "six million, four hundred three thousand, eight hundred ninety".