1978266903 has 16 divisors (see below), whose sum is σ = 2672495616. Its totient is φ = 1301477760.

The previous prime is 1978266893. The next prime is 1978266919. The reversal of 1978266903 is 3096628791.

It is not a de Polignac number, because 1978266903 - 2¹⁸ = 1978004759 is a prime.

It is a super-2 number, since 2×1978266903² = 7827079879010422818, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1978266973) 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, 242751 + ... + 250767.

It is an arithmetic number, because the mean of its divisors is an integer number (167030976).

Almost surely, 2^1978266903 is an apocalyptic number.

1978266903 is a deficient number, since it is larger than the sum of its proper divisors (694228713).

1978266903 is an equidigital number, since it uses as much as digits as its factorization.

1978266903 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9094.

The product of its (nonzero) digits is 979776, while the sum is 51.

The square root of 1978266903 is about 44477.7124299351. The cubic root of 1978266903 is about 1255.3407545473.

The spelling of 1978266903 in words is "one billion, nine hundred seventy-eight million, two hundred sixty-six thousand, nine hundred three".