2865390 has 64 divisors (see below), whose sum is σ = 7914240. Its totient is φ = 656640.

The previous prime is 2865383. The next prime is 2865397. The reversal of 2865390 is 935682.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (2865383) and next prime (2865397).

It is a Harshad number since it is a multiple of its sum of digits (33).

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2865397) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6042 + ... + 6498.

It is an arithmetic number, because the mean of its divisors is an integer number (123660).

2^2865390 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2865390, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3957120).

2865390 is an abundant number, since it is smaller than the sum of its proper divisors (5048850).

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

2865390 is a wasteful number, since it uses less digits than its factorization.

2865390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 497.

The product of its (nonzero) digits is 12960, while the sum is 33.

The square root of 2865390 is about 1692.7462893180. The cubic root of 2865390 is about 142.0347398968.

The spelling of 2865390 in words is "two million, eight hundred sixty-five thousand, three hundred ninety".