1203129978 has 16 divisors (see below), whose sum is σ = 2430085536. Its totient is φ = 397072400.

The previous prime is 1203129973. The next prime is 1203129997. The reversal of 1203129978 is 8799213021.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (1203129973) 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, 992076 + ... + 993287.

It is an arithmetic number, because the mean of its divisors is an integer number (151880346).

Almost surely, 2^1203129978 is an apocalyptic number.

1203129978 is an abundant number, since it is smaller than the sum of its proper divisors (1226955558).

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

1203129978 is a wasteful number, since it uses less digits than its factorization.

1203129978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1985469.

The product of its (nonzero) digits is 54432, while the sum is 42.

The square root of 1203129978 is about 34686.1640715718. The cubic root of 1203129978 is about 1063.5816831518.

The spelling of 1203129978 in words is "one billion, two hundred three million, one hundred twenty-nine thousand, nine hundred seventy-eight".