2621987 has 2 divisors, whose sum is σ = 2621988. Its totient is φ = 2621986.

The previous prime is 2621951. The next prime is 2622013. The reversal of 2621987 is 7891262.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2621987 - 2⁶ = 2621923 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (2621917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1310993 + 1310994.

It is an arithmetic number, because the mean of its divisors is an integer number (1310994).

2^2621987 is an apocalyptic number.

2621987 is a deficient number, since it is larger than the sum of its proper divisors (1).

2621987 is an equidigital number, since it uses as much as digits as its factorization.

2621987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12096, while the sum is 35.

The square root of 2621987 is about 1619.2550756444. The cubic root of 2621987 is about 137.8934099555.

The spelling of 2621987 in words is "two million, six hundred twenty-one thousand, nine hundred eighty-seven".