1387646 has 24 divisors (see below), whose sum is σ = 2404920. Its totient is φ = 595296.

The previous prime is 1387601. The next prime is 1387649. The reversal of 1387646 is 6467831.

It is a super-2 number, since 2×1387646² = 3851122842632, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1387649) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 26156 + ... + 26208.

It is an arithmetic number, because the mean of its divisors is an integer number (100205).

2^1387646 is an apocalyptic number.

1387646 is a deficient number, since it is larger than the sum of its proper divisors (1017274).

1387646 is a wasteful number, since it uses less digits than its factorization.

1387646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140 (or 87 counting only the distinct ones).

The product of its digits is 24192, while the sum is 35.

The square root of 1387646 is about 1177.9838708573. The cubic root of 1387646 is about 111.5388671835.

The spelling of 1387646 in words is "one million, three hundred eighty-seven thousand, six hundred forty-six".