1864149538 has 4 divisors (see below), whose sum is σ = 2796224310. Its totient is φ = 932074768.

The previous prime is 1864149533. The next prime is 1864149541. The reversal of 1864149538 is 8359414681.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8359414681 = 1237 ⋅6757813.

It can be written as a sum of positive squares in only one way, i.e., 1055145289 + 809004249 = 32483^2 + 28443^2 .

It is a super-2 number, since 2×1864149538² = 6950107000051226888, which contains 22 as substring.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 1864149491 and 1864149500.

It is not an unprimeable number, because it can be changed into a prime (1864149533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 466037383 + ... + 466037386.

Almost surely, 2^1864149538 is an apocalyptic number.

1864149538 is a deficient number, since it is larger than the sum of its proper divisors (932074772).

1864149538 is an equidigital number, since it uses as much as digits as its factorization.

1864149538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 932074771.

The product of its digits is 829440, while the sum is 49.

The square root of 1864149538 is about 43175.7980586347. The cubic root of 1864149538 is about 1230.7228082436.

The spelling of 1864149538 in words is "one billion, eight hundred sixty-four million, one hundred forty-nine thousand, five hundred thirty-eight".