2639420 has 48 divisors (see below), whose sum is σ = 6713280. Its totient is φ = 850944.

The previous prime is 2639419. The next prime is 2639431. The reversal of 2639420 is 249362.

2639420 = 386² + 387² + ... + 402².

It is a self number, because there is not a number n which added to its sum of digits gives 2639420.

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, 1826 + ... + 2934.

It is an arithmetic number, because the mean of its divisors is an integer number (139860).

2^2639420 is an apocalyptic number.

2639420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2639420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3356640).

2639420 is an abundant number, since it is smaller than the sum of its proper divisors (4073860).

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

2639420 is a wasteful number, since it uses less digits than its factorization.

2639420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1142 (or 1140 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 26.

The square root of 2639420 is about 1624.6291884612. The cubic root of 2639420 is about 138.1983425320.

The spelling of 2639420 in words is "two million, six hundred thirty-nine thousand, four hundred twenty".