2661406 has 16 divisors (see below), whose sum is σ = 4584960. Its totient is φ = 1145880.

The previous prime is 2661403. The next prime is 2661409. The reversal of 2661406 is 6041662.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (2661403) and next prime (2661409).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2661403) 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, 2766 + ... + 3601.

It is an arithmetic number, because the mean of its divisors is an integer number (286560).

2^2661406 is an apocalyptic number.

2661406 is a deficient number, since it is larger than the sum of its proper divisors (1923554).

2661406 is a wasteful number, since it uses less digits than its factorization.

2661406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6399.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 2661406 is about 1631.3816230423. The cubic root of 2661406 is about 138.5810062766.

The spelling of 2661406 in words is "two million, six hundred sixty-one thousand, four hundred six".