1286652438 has 48 divisors (see below), whose sum is σ = 2897556480. Its totient is φ = 427911336.

The previous prime is 1286652421. The next prime is 1286652457. The reversal of 1286652438 is 8342566821.

1286652438 is a `hidden beast` number, since 12 + 86 + 6 + 524 + 38 = 666.

It is a super-2 number, since 2×1286652438² = 3310948992422687688, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1286652393 and 1286652402.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 230031 + ... + 235557.

It is an arithmetic number, because the mean of its divisors is an integer number (60365760).

Almost surely, 2^1286652438 is an apocalyptic number.

1286652438 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1286652438, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1448778240).

1286652438 is an abundant number, since it is smaller than the sum of its proper divisors (1610904042).

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

1286652438 is an equidigital number, since it uses as much as digits as its factorization.

1286652438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6023 (or 6011 counting only the distinct ones).

The product of its digits is 552960, while the sum is 45.

The square root of 1286652438 is about 35869.9378031242. The cubic root of 1286652438 is about 1087.6447864302.

It can be divided in two parts, 128 and 6652438, that added together give a palindrome (6652566).

The spelling of 1286652438 in words is "one billion, two hundred eighty-six million, six hundred fifty-two thousand, four hundred thirty-eight".