1264185138 has 8 divisors (see below), whose sum is σ = 2528370288. Its totient is φ = 421395044.

The previous prime is 1264185119. The next prime is 1264185151. The reversal of 1264185138 is 8315814621.

It is a sphenic number, since it is the product of 3 distinct primes.

1264185138 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 1264185096 and 1264185105.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 105348756 + ... + 105348767.

It is an arithmetic number, because the mean of its divisors is an integer number (316046286).

Almost surely, 2^1264185138 is an apocalyptic number.

1264185138 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1264185138 is a wasteful number, since it uses less digits than its factorization.

1264185138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210697528.

The product of its digits is 46080, while the sum is 39.

The square root of 1264185138 is about 35555.3812804757. The cubic root of 1264185138 is about 1081.2768215116.

Adding to 1264185138 its reverse (8315814621), we get a palindrome (9579999759).

It can be divided in two parts, 12641 and 85138, that added together give a palindrome (97779).

The spelling of 1264185138 in words is "one billion, two hundred sixty-four million, one hundred eighty-five thousand, one hundred thirty-eight".