1978250990 has 32 divisors (see below), whose sum is σ = 3616436160. Its totient is φ = 778982400.

The previous prime is 1978250977. The next prime is 1978250993. The reversal of 1978250990 is 990528791.

It is a happy number.

It is a super-3 number, since 3×1978250990³ (a number of 29 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1978250993) 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, 586910 + ... + 590270.

It is an arithmetic number, because the mean of its divisors is an integer number (113013630).

Almost surely, 2^1978250990 is an apocalyptic number.

1978250990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1978250990 is a deficient number, since it is larger than the sum of its proper divisors (1638185170).

1978250990 is a wasteful number, since it uses less digits than its factorization.

1978250990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4268.

The product of its (nonzero) digits is 408240, while the sum is 50.

The square root of 1978250990 is about 44477.5335422278. The cubic root of 1978250990 is about 1255.3373885891.

The spelling of 1978250990 in words is "one billion, nine hundred seventy-eight million, two hundred fifty thousand, nine hundred ninety".