2651940 has 60 divisors (see below), whose sum is σ = 8324316. Its totient is φ = 706752.

The previous prime is 2651911. The next prime is 2651947. The reversal of 2651940 is 491562.

2651940 is a `hidden beast` number, since 2 + 651 + 9 + 4 + 0 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 419904 + 2232036 = 648^2 + 1494^2 .

It is a tau number, because it is divible by the number of its divisors (60).

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (2651947) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 802 + ... + 2438.

2^2651940 is an apocalyptic number.

2651940 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 2651940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4162158).

2651940 is an abundant number, since it is smaller than the sum of its proper divisors (5672376).

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

2651940 is a wasteful number, since it uses less digits than its factorization.

2651940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1658 (or 1647 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 2651940 is about 1628.4778168584. The cubic root of 2651940 is about 138.4165109998.

The spelling of 2651940 in words is "two million, six hundred fifty-one thousand, nine hundred forty".