6402990 has 32 divisors (see below), whose sum is σ = 16765056. Its totient is φ = 1552160.

The previous prime is 6402973. The next prime is 6403003. The reversal of 6402990 is 992046.

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

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 15 ways as a sum of consecutive naturals, for example, 9372 + ... + 10031.

It is an arithmetic number, because the mean of its divisors is an integer number (523908).

Almost surely, 2^6402990 is an apocalyptic number.

6402990 is an abundant number, since it is smaller than the sum of its proper divisors (10362066).

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

6402990 is a wasteful number, since it uses less digits than its factorization.

6402990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19424.

The product of its (nonzero) digits is 3888, while the sum is 30.

The square root of 6402990 is about 2530.4130097674. The cubic root of 6402990 is about 185.6924620735.

The spelling of 6402990 in words is "six million, four hundred two thousand, nine hundred ninety".