1387421 has 16 divisors (see below), whose sum is σ = 1710720. Its totient is φ = 1098240.

The previous prime is 1387417. The next prime is 1387427. The reversal of 1387421 is 1247831.

It is a cyclic number.

It is not a de Polignac number, because 1387421 - 2² = 1387417 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1387427) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10526 + ... + 10656.

It is an arithmetic number, because the mean of its divisors is an integer number (106920).

2^1387421 is an apocalyptic number.

It is an amenable number.

1387421 is a deficient number, since it is larger than the sum of its proper divisors (323299).

1387421 is a wasteful number, since it uses less digits than its factorization.

1387421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244.

The product of its digits is 1344, while the sum is 26.

The square root of 1387421 is about 1177.8883648292. Note that the first 3 decimals coincide. The cubic root of 1387421 is about 111.5328383640.

The spelling of 1387421 in words is "one million, three hundred eighty-seven thousand, four hundred twenty-one".