1377561 has 8 divisors (see below), whose sum is σ = 1944864. Its totient is φ = 864320.

The previous prime is 1377553. The next prime is 1377577. The reversal of 1377561 is 1657731.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1377561 - 2³ = 1377553 is a prime.

1377561 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1378561) 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, 13455 + ... + 13556.

It is an arithmetic number, because the mean of its divisors is an integer number (243108).

2^1377561 is an apocalyptic number.

It is an amenable number.

1377561 is a deficient number, since it is larger than the sum of its proper divisors (567303).

1377561 is a wasteful number, since it uses less digits than its factorization.

1377561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27031.

The product of its digits is 4410, while the sum is 30.

The square root of 1377561 is about 1173.6954460166. The cubic root of 1377561 is about 111.2679994443.

The spelling of 1377561 in words is "one million, three hundred seventy-seven thousand, five hundred sixty-one".