1540167978 has 64 divisors (see below), whose sum is σ = 3251404800. Its totient is φ = 485724480.

The previous prime is 1540167977. The next prime is 1540167983. The reversal of 1540167978 is 8797610451.

It is not an unprimeable number, because it can be changed into a prime (1540167977) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3215143 + ... + 3215621.

It is an arithmetic number, because the mean of its divisors is an integer number (50803200).

Almost surely, 2^1540167978 is an apocalyptic number.

1540167978 is an abundant number, since it is smaller than the sum of its proper divisors (1711236822).

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

1540167978 is a wasteful number, since it uses less digits than its factorization.

1540167978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 867.

The product of its (nonzero) digits is 423360, while the sum is 48.

The square root of 1540167978 is about 39244.9739202360. The cubic root of 1540167978 is about 1154.8423360060.

The spelling of 1540167978 in words is "one billion, five hundred forty million, one hundred sixty-seven thousand, nine hundred seventy-eight".