1540139628 has 24 divisors (see below), whose sum is σ = 3613740480. Its totient is φ = 510511120.

The previous prime is 1540139611. The next prime is 1540139641. The reversal of 1540139628 is 8269310451.

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 356358 + ... + 360653.

It is an arithmetic number, because the mean of its divisors is an integer number (150572520).

Almost surely, 2^1540139628 is an apocalyptic number.

It is an amenable number.

1540139628 is an abundant number, since it is smaller than the sum of its proper divisors (2073600852).

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

1540139628 is a wasteful number, since it uses less digits than its factorization.

1540139628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 717197 (or 717195 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 39.

The square root of 1540139628 is about 39244.6127258252. The cubic root of 1540139628 is about 1154.8352502029.

The spelling of 1540139628 in words is "one billion, five hundred forty million, one hundred thirty-nine thousand, six hundred twenty-eight".