1651440340 has 24 divisors (see below), whose sum is σ = 3783300192. Its totient is φ = 600523680.

The previous prime is 1651440331. The next prime is 1651440389. The reversal of 1651440340 is 430441561.

It is a junction number, because it is equal to n+sod(n) for n = 1651440299 and 1651440308.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3753054 + ... + 3753493.

It is an arithmetic number, because the mean of its divisors is an integer number (157637508).

Almost surely, 2^1651440340 is an apocalyptic number.

1651440340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1651440340 is an abundant number, since it is smaller than the sum of its proper divisors (2131859852).

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

1651440340 is a wasteful number, since it uses less digits than its factorization.

1651440340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7506567 (or 7506565 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 28.

The square root of 1651440340 is about 40637.9175155421. The cubic root of 1651440340 is about 1182.0094889408.

The spelling of 1651440340 in words is "one billion, six hundred fifty-one million, four hundred forty thousand, three hundred forty".