1356138 has 48 divisors (see below), whose sum is σ = 3444480. Its totient is φ = 377568.

The previous prime is 1356133. The next prime is 1356143. The reversal of 1356138 is 8316531.

It is an interprime number because it is at equal distance from previous prime (1356133) and next prime (1356143).

It is a super-2 number, since 2×1356138² = 3678220550088, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1356133) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5808 + ... + 6036.

It is an arithmetic number, because the mean of its divisors is an integer number (71760).

2^1356138 is an apocalyptic number.

1356138 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 1356138, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1722240).

1356138 is an abundant number, since it is smaller than the sum of its proper divisors (2088342).

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

1356138 is a wasteful number, since it uses less digits than its factorization.

1356138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 291 (or 288 counting only the distinct ones).

The product of its digits is 2160, while the sum is 27.

The square root of 1356138 is about 1164.5333829479. The cubic root of 1356138 is about 110.6881923741.

The spelling of 1356138 in words is "one million, three hundred fifty-six thousand, one hundred thirty-eight".