1540405650 has 72 divisors (see below), whose sum is σ = 4443934320. Its totient is φ = 352091040.

The previous prime is 1540405619. The next prime is 1540405661. The reversal of 1540405650 is 565040451.

1540405650 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 97440 + ... + 112139.

It is an arithmetic number, because the mean of its divisors is an integer number (61721310).

Almost surely, 2^1540405650 is an apocalyptic number.

1540405650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1540405650 is an abundant number, since it is smaller than the sum of its proper divisors (2903528670).

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

1540405650 is a wasteful number, since it uses less digits than its factorization.

1540405650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209608 (or 209596 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 30.

The square root of 1540405650 is about 39248.0018599673. The cubic root of 1540405650 is about 1154.9017363602.

The spelling of 1540405650 in words is "one billion, five hundred forty million, four hundred five thousand, six hundred fifty".