2661405 has 8 divisors (see below), whose sum is σ = 4258272. Its totient is φ = 1419408.

The previous prime is 2661403. The next prime is 2661409. The reversal of 2661405 is 5041662.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2661405 - 2¹ = 2661403 is a prime.

2661405 is a lucky number.

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, 88699 + ... + 88728.

It is an arithmetic number, because the mean of its divisors is an integer number (532284).

2^2661405 is an apocalyptic number.

It is an amenable number.

2661405 is a deficient number, since it is larger than the sum of its proper divisors (1596867).

2661405 is a wasteful number, since it uses less digits than its factorization.

2661405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177435.

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 2661405 is about 1631.3813165536. The cubic root of 2661405 is about 138.5809889198.

The spelling of 2661405 in words is "two million, six hundred sixty-one thousand, four hundred five".