2405691 has 6 divisors (see below), whose sum is σ = 3474900. Its totient is φ = 1603788.

The previous prime is 2405677. The next prime is 2405701. The reversal of 2405691 is 1965042.

It is not a de Polignac number, because 2405691 - 2⁷ = 2405563 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2405621) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 133641 + ... + 133658.

It is an arithmetic number, because the mean of its divisors is an integer number (579150).

2^2405691 is an apocalyptic number.

2405691 is a deficient number, since it is larger than the sum of its proper divisors (1069209).

2405691 is a wasteful number, since it uses less digits than its factorization.

2405691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 267305 (or 267302 counting only the distinct ones).

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

The square root of 2405691 is about 1551.0290132683. The cubic root of 2405691 is about 133.9923326719.

The spelling of 2405691 in words is "two million, four hundred five thousand, six hundred ninety-one".