2639407 has 2 divisors, whose sum is σ = 2639408. Its totient is φ = 2639406.

The previous prime is 2639401. The next prime is 2639419. The reversal of 2639407 is 7049362.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2639407 is a prime.

2639407 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2639401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1319703 + 1319704.

It is an arithmetic number, because the mean of its divisors is an integer number (1319704).

2^2639407 is an apocalyptic number.

2639407 is a deficient number, since it is larger than the sum of its proper divisors (1).

2639407 is an equidigital number, since it uses as much as digits as its factorization.

2639407 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9072, while the sum is 31.

The square root of 2639407 is about 1624.6251875433. The cubic root of 2639407 is about 138.1981156410.

The spelling of 2639407 in words is "two million, six hundred thirty-nine thousand, four hundred seven".