1646246440 has 32 divisors (see below), whose sum is σ = 3782868480. Its totient is φ = 644487232.

The previous prime is 1646246429. The next prime is 1646246447. The reversal of 1646246440 is 446426461.

It is a self number, because there is not a number n which added to its sum of digits gives 1646246440.

It is not an unprimeable number, because it can be changed into a prime (1646246447) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 435952 + ... + 439711.

It is an arithmetic number, because the mean of its divisors is an integer number (118214640).

Almost surely, 2^1646246440 is an apocalyptic number.

1646246440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1646246440 is an abundant number, since it is smaller than the sum of its proper divisors (2136622040).

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

1646246440 is a wasteful number, since it uses less digits than its factorization.

1646246440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 875721 (or 875717 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 37.

The square root of 1646246440 is about 40573.9625868610. The cubic root of 1646246440 is about 1180.7690189658.

The spelling of 1646246440 in words is "one billion, six hundred forty-six million, two hundred forty-six thousand, four hundred forty".