6431390 has 32 divisors (see below), whose sum is σ = 13409280. Its totient is φ = 2175264.

The previous prime is 6431387. The next prime is 6431401. The reversal of 6431390 is 931346.

It is a Curzon number.

It is a congruent number.

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, 4949 + ... + 6111.

It is an arithmetic number, because the mean of its divisors is an integer number (419040).

Almost surely, 2^6431390 is an apocalyptic number.

6431390 is an abundant number, since it is smaller than the sum of its proper divisors (6977890).

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

6431390 is a wasteful number, since it uses less digits than its factorization.

6431390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1256.

The product of its (nonzero) digits is 1944, while the sum is 26.

The square root of 6431390 is about 2536.0185330553. The cubic root of 6431390 is about 185.9665990049.

The spelling of 6431390 in words is "six million, four hundred thirty-one thousand, three hundred ninety".