1387190025 has 81 divisors (see below), whose sum is σ = 2704597077. Its totient is φ = 679348800.

The previous prime is 1387189967. The next prime is 1387190027. The reversal of 1387190025 is 5200917831.

The square root of 1387190025 is 37245.

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

It can be written as a sum of positive squares in 4 ways, for example, as 357550281 + 1029639744 = 18909^2 + 32088^2 .

It is not a de Polignac number, because 1387190025 - 2⁹ = 1387189513 is a prime.

It is a super-3 number, since 3×1387190025³ (a number of 28 digits) contains 333 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1387190027) by changing a digit.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 7262680 + ... + 7262870.

Almost surely, 2^1387190025 is an apocalyptic number.

1387190025 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1387190025 is the 37245-th square number.

1387190025 is the 18623-rd centered octagonal number.

It is an amenable number.

1387190025 is a deficient number, since it is larger than the sum of its proper divisors (1317407052).

1387190025 is a wasteful number, since it uses less digits than its factorization.

1387190025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 424 (or 212 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 36.

The cubic root of 1387190025 is about 1115.2664876789.

Multiplying 1387190025 by its sum of digits (36), we get a square (49938840900 = 223470²).

The spelling of 1387190025 in words is "one billion, three hundred eighty-seven million, one hundred ninety thousand, twenty-five".