1978572225 has 72 divisors (see below), whose sum is σ = 3908434368. Its totient is φ = 879984000.

The previous prime is 1978572223. The next prime is 1978572269. The reversal of 1978572225 is 5222758791.

It is not a de Polignac number, because 1978572225 - 2¹ = 1978572223 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1978572223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 128700 + ... + 143250.

Almost surely, 2^1978572225 is an apocalyptic number.

1978572225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1978572225 is a deficient number, since it is larger than the sum of its proper divisors (1929862143).

1978572225 is a wasteful number, since it uses less digits than its factorization.

1978572225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14615 (or 14603 counting only the distinct ones).

The product of its digits is 705600, while the sum is 48.

The square root of 1978572225 is about 44481.1446008306. The cubic root of 1978572225 is about 1255.4053335369.

The spelling of 1978572225 in words is "one billion, nine hundred seventy-eight million, five hundred seventy-two thousand, two hundred twenty-five".