2400391 has 8 divisors (see below), whose sum is σ = 2764160. Its totient is φ = 2041848.

The previous prime is 2400367. The next prime is 2400407. The reversal of 2400391 is 1930042.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2400391 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2400311) 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, 261 + ... + 2206.

It is an arithmetic number, because the mean of its divisors is an integer number (345520).

2^2400391 is an apocalyptic number.

2400391 is the 895-th hex number.

2400391 is a deficient number, since it is larger than the sum of its proper divisors (363769).

2400391 is a wasteful number, since it uses less digits than its factorization.

2400391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2613.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 2400391 is about 1549.3195280509. The cubic root of 2400391 is about 133.8938604073.

The spelling of 2400391 in words is "two million, four hundred thousand, three hundred ninety-one".