426990 has 32 divisors (see below), whose sum is σ = 1051776. Its totient is φ = 110880.

The previous prime is 426973. The next prime is 426997. The reversal of 426990 is 99624.

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

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (426997) by changing a digit.

426990 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1125 + ... + 1455.

It is an arithmetic number, because the mean of its divisors is an integer number (32868).

2⁴²⁶⁹⁹⁰ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 426990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (525888).

426990 is an abundant number, since it is smaller than the sum of its proper divisors (624786).

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

426990 is a wasteful number, since it uses less digits than its factorization.

426990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 384.

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

The square root of 426990 is about 653.4447183963. Note that the first 3 decimals coincide. The cubic root of 426990 is about 75.3018942785.

The spelling of 426990 in words is "four hundred twenty-six thousand, nine hundred ninety".