3900649 has 2 divisors, whose sum is σ = 3900650. Its totient is φ = 3900648.

The previous prime is 3900623. The next prime is 3900679. The reversal of 3900649 is 9460093.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3841600 + 59049 = 1960^2 + 243^2 .

It is an emirp because it is prime and its reverse (9460093) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3900649 - 2¹³ = 3892457 is a prime.

It is equal to p₂₇₆₆₄₆ and since 3900649 and 276646 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 3900649.

It is not a weakly prime, because it can be changed into another prime (3900679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1950324 + 1950325.

It is an arithmetic number, because the mean of its divisors is an integer number (1950325).

Almost surely, 2^3900649 is an apocalyptic number.

It is an amenable number.

3900649 is a deficient number, since it is larger than the sum of its proper divisors (1).

3900649 is an equidigital number, since it uses as much as digits as its factorization.

3900649 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5832, while the sum is 31.

The square root of 3900649 is about 1975.0060759400. The cubic root of 3900649 is about 157.4148225082.

The spelling of 3900649 in words is "three million, nine hundred thousand, six hundred forty-nine".