1540329999 has 16 divisors (see below), whose sum is σ = 2341860192. Its totient is φ = 892136448.

The previous prime is 1540329991. The next prime is 1540330009. The reversal of 1540329999 is 9999230451.

It is a happy number.

It is not a de Polignac number, because 1540329999 - 2³ = 1540329991 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1540329991) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1160974 + ... + 1162299.

It is an arithmetic number, because the mean of its divisors is an integer number (146366262).

Almost surely, 2^1540329999 is an apocalyptic number.

1540329999 is a deficient number, since it is larger than the sum of its proper divisors (801530193).

1540329999 is a wasteful number, since it uses less digits than its factorization.

1540329999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2323306.

The product of its (nonzero) digits is 787320, while the sum is 51.

The square root of 1540329999 is about 39247.0380920650. The cubic root of 1540329999 is about 1154.8828298898.

The spelling of 1540329999 in words is "one billion, five hundred forty million, three hundred twenty-nine thousand, nine hundred ninety-nine".