1521303978 has 16 divisors (see below), whose sum is σ = 3046314816. Its totient is φ = 506483520.

The previous prime is 1521303977. The next prime is 1521303991. The reversal of 1521303978 is 8793031251.

It is not an unprimeable number, because it can be changed into a prime (1521303977) 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, 149103 + ... + 158978.

It is an arithmetic number, because the mean of its divisors is an integer number (190394676).

Almost surely, 2^1521303978 is an apocalyptic number.

1521303978 is an abundant number, since it is smaller than the sum of its proper divisors (1525010838).

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

1521303978 is a wasteful number, since it uses less digits than its factorization.

1521303978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 308909.

The product of its (nonzero) digits is 45360, while the sum is 39.

The square root of 1521303978 is about 39003.8969591501. The cubic root of 1521303978 is about 1150.1081128352.

The spelling of 1521303978 in words is "one billion, five hundred twenty-one million, three hundred three thousand, nine hundred seventy-eight".