1540026640 has 40 divisors (see below), whose sum is σ = 3736243008. Its totient is φ = 589226880.

The previous prime is 1540026623. The next prime is 1540026641. The reversal of 1540026640 is 466200451.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 1540026599 and 1540026608.

It is not an unprimeable number, because it can be changed into a prime (1540026641) 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, 416646 + ... + 420325.

Almost surely, 2^1540026640 is an apocalyptic number.

1540026640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1540026640 is an abundant number, since it is smaller than the sum of its proper divisors (2196216368).

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

1540026640 is a wasteful number, since it uses less digits than its factorization.

1540026640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 837007 (or 837001 counting only the distinct ones).

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

The square root of 1540026640 is about 39243.1731642588. The cubic root of 1540026640 is about 1154.8070091019.

The spelling of 1540026640 in words is "one billion, five hundred forty million, twenty-six thousand, six hundred forty".