6429990 has 64 divisors (see below), whose sum is σ = 17938944. Its totient is φ = 1444608.

The previous prime is 6429977. The next prime is 6430003. The reversal of 6429990 is 999246.

It is an interprime number because it is at equal distance from previous prime (6429977) and next prime (6430003).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13842 + ... + 14298.

It is an arithmetic number, because the mean of its divisors is an integer number (280296).

Almost surely, 2^6429990 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6429990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8969472).

6429990 is an abundant number, since it is smaller than the sum of its proper divisors (11508954).

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

6429990 is a wasteful number, since it uses less digits than its factorization.

6429990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 541.

The product of its (nonzero) digits is 34992, while the sum is 39.

The square root of 6429990 is about 2535.7424948129. The cubic root of 6429990 is about 185.9531041444.

The spelling of 6429990 in words is "six million, four hundred twenty-nine thousand, nine hundred ninety".