1939209428025 has 243 divisors, whose sum is σ = 3807452038221. Its totient is φ = 943283335680.

The previous prime is 1939209427999. The next prime is 1939209428069. The reversal of 1939209428025 is 5208249029391.

The square root of 1939209428025 is 1392555.

It is a perfect power (a square), and thus also a powerful number.

1939209428025 is a `hidden beast` number, since 1 + 9 + 3 + 9 + 209 + 428 + 0 + 2 + 5 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 45360054441 + 1893849373584 = 212979^2 + 1376172^2 .

It is not a de Polignac number, because 1939209428025 - 2¹¹ = 1939209425977 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 242 ways as a sum of consecutive naturals, for example, 15269365512 + ... + 15269365638.

Almost surely, 2^{1939209428025} is an apocalyptic number.

1939209428025 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1939209428025 is the 1392555-th square number.

1939209428025 is the 696278-th centered octagonal number.

It is an amenable number.

1939209428025 is a deficient number, since it is larger than the sum of its proper divisors (1868242610196).

1939209428025 is a wasteful number, since it uses less digits than its factorization.

1939209428025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 390 (or 195 counting only the distinct ones).

The product of its (nonzero) digits is 2799360, while the sum is 54.

The spelling of 1939209428025 in words is "one trillion, nine hundred thirty-nine billion, two hundred nine million, four hundred twenty-eight thousand, twenty-five".