2991540 has 48 divisors (see below), whose sum is σ = 8503488. Its totient is φ = 785664.

The previous prime is 2991523. The next prime is 2991551. The reversal of 2991540 is 451992.

2991540 = T₁₂₅ + T₁₂₆ + ... + T₂₇₀.

It is a happy number.

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

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 2991498 and 2991507.

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, 4039 + ... + 4721.

It is an arithmetic number, because the mean of its divisors is an integer number (177156).

2^2991540 is an apocalyptic number.

2991540 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 2991540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4251744).

2991540 is an abundant number, since it is smaller than the sum of its proper divisors (5511948).

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

2991540 is a wasteful number, since it uses less digits than its factorization.

2991540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 768 (or 766 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 30.

The square root of 2991540 is about 1729.6068917532. The cubic root of 2991540 is about 144.0892579339.

The spelling of 2991540 in words is "two million, nine hundred ninety-one thousand, five hundred forty".