2807940 has 48 divisors (see below), whose sum is σ = 8019648. Its totient is φ = 733824.

The previous prime is 2807933. The next prime is 2807947. The reversal of 2807940 is 497082.

It is an interprime number because it is at equal distance from previous prime (2807933) and next prime (2807947).

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

It is a junction number, because it is equal to n+sod(n) for n = 2807898 and 2807907.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2807947) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2739 + ... + 3621.

It is an arithmetic number, because the mean of its divisors is an integer number (167076).

2^2807940 is an apocalyptic number.

2807940 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 2807940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4009824).

2807940 is an abundant number, since it is smaller than the sum of its proper divisors (5211708).

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

2807940 is a wasteful number, since it uses less digits than its factorization.

2807940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 948 (or 946 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 30.

The square root of 2807940 is about 1675.6909022848. The cubic root of 2807940 is about 141.0790764122.

The spelling of 2807940 in words is "two million, eight hundred seven thousand, nine hundred forty".