1978143502 has 16 divisors (see below), whose sum is σ = 3018070224. Its totient is φ = 972144000.

The previous prime is 1978143493. The next prime is 1978143509. The reversal of 1978143502 is 2053418791.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1978143509) 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, 186502 + ... + 196822.

It is an arithmetic number, because the mean of its divisors is an integer number (188629389).

Almost surely, 2^1978143502 is an apocalyptic number.

1978143502 is a deficient number, since it is larger than the sum of its proper divisors (1039926722).

1978143502 is a wasteful number, since it uses less digits than its factorization.

1978143502 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11955.

The product of its (nonzero) digits is 60480, while the sum is 40.

The square root of 1978143502 is about 44476.3251854287. The cubic root of 1978143502 is about 1255.3146519816.

The spelling of 1978143502 in words is "one billion, nine hundred seventy-eight million, one hundred forty-three thousand, five hundred two".