1902649 has 4 divisors (see below), whose sum is σ = 2174464. Its totient is φ = 1630836.

The previous prime is 1902643. The next prime is 1902653. The reversal of 1902649 is 9462091.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1902649 - 2⁵ = 1902617 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1902649.

It is not an unprimeable number, because it can be changed into a prime (1902643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 135897 + ... + 135910.

It is an arithmetic number, because the mean of its divisors is an integer number (543616).

2^1902649 is an apocalyptic number.

It is an amenable number.

1902649 is a deficient number, since it is larger than the sum of its proper divisors (271815).

1902649 is an equidigital number, since it uses as much as digits as its factorization.

1902649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 271814.

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 1902649 is about 1379.3654338137. The cubic root of 1902649 is about 123.9137667878.

The spelling of 1902649 in words is "one million, nine hundred two thousand, six hundred forty-nine".