1381556 has 24 divisors (see below), whose sum is σ = 2794176. Its totient is φ = 590720.

The previous prime is 1381553. The next prime is 1381559. The reversal of 1381556 is 6551831.

It is an interprime number because it is at equal distance from previous prime (1381553) and next prime (1381559).

It is a super-2 number, since 2×1381556² = 3817393962272, which contains 22 as substring.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1381553) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 176 + ... + 1671.

It is an arithmetic number, because the mean of its divisors is an integer number (116424).

2^1381556 is an apocalyptic number.

It is an amenable number.

1381556 is an abundant number, since it is smaller than the sum of its proper divisors (1412620).

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

1381556 is a wasteful number, since it uses less digits than its factorization.

1381556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1879 (or 1877 counting only the distinct ones).

The product of its digits is 3600, while the sum is 29.

The square root of 1381556 is about 1175.3961034477. The cubic root of 1381556 is about 111.3754566682.

The spelling of 1381556 in words is "one million, three hundred eighty-one thousand, five hundred fifty-six".