1864425987 has 6 divisors (see below), whose sum is σ = 2693059772. Its totient is φ = 1242950652.

The previous prime is 1864425973. The next prime is 1864426001. The reversal of 1864425987 is 7895244681.

It is a happy number.

1864425987 is a `hidden beast` number, since 1 + 8 + 6 + 4 + 42 + 598 + 7 = 666.

It is an interprime number because it is at equal distance from previous prime (1864425973) and next prime (1864426001).

It is not a de Polignac number, because 1864425987 - 2¹⁰ = 1864424963 is a prime.

It is a super-2 number, since 2×1864425987² = 6952168522001848338, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1864425907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 103579213 + ... + 103579230.

Almost surely, 2^1864425987 is an apocalyptic number.

1864425987 is a deficient number, since it is larger than the sum of its proper divisors (828633785).

1864425987 is a wasteful number, since it uses less digits than its factorization.

1864425987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207158449 (or 207158446 counting only the distinct ones).

The product of its digits is 3870720, while the sum is 54.

The square root of 1864425987 is about 43178.9993746960. Note that the first 3 decimals coincide. The cubic root of 1864425987 is about 1230.7836430042.

Adding to 1864425987 its sum of digits (54), we get a square (1864426041 = 43179²).

The spelling of 1864425987 in words is "one billion, eight hundred sixty-four million, four hundred twenty-five thousand, nine hundred eighty-seven".