1649240 has 16 divisors (see below), whose sum is σ = 3710880. Its totient is φ = 659680.

The previous prime is 1649237. The next prime is 1649243. The reversal of 1649240 is 429461.

It is an interprime number because it is at equal distance from previous prime (1649237) and next prime (1649243).

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1649243) 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, 20576 + ... + 20655.

It is an arithmetic number, because the mean of its divisors is an integer number (231930).

2^1649240 is an apocalyptic number.

1649240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1649240 is an abundant number, since it is smaller than the sum of its proper divisors (2061640).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1649240 is a wasteful number, since it uses less digits than its factorization.

1649240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41242 (or 41238 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 1649240 is about 1284.2273941947. The cubic root of 1649240 is about 118.1484295136.

The spelling of 1649240 in words is "one million, six hundred forty-nine thousand, two hundred forty".