2991620 has 24 divisors (see below), whose sum is σ = 6348888. Its totient is φ = 1184000.

The previous prime is 2991619. The next prime is 2991629. The reversal of 2991620 is 261992.

It can be written as a sum of positive squares in 4 ways, for example, as 894916 + 2096704 = 946^2 + 1448^2 .

It is not an unprimeable number, because it can be changed into a prime (2991629) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1280 + ... + 2760.

It is an arithmetic number, because the mean of its divisors is an integer number (264537).

2^2991620 is an apocalyptic number.

2991620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2991620 is an abundant number, since it is smaller than the sum of its proper divisors (3357268).

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

2991620 is a wasteful number, since it uses less digits than its factorization.

2991620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1591 (or 1589 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 2991620 is about 1729.6300182409. The cubic root of 2991620 is about 144.0905423379.

The spelling of 2991620 in words is "two million, nine hundred ninety-one thousand, six hundred twenty".