1379581 has 4 divisors (see below), whose sum is σ = 1576672. Its totient is φ = 1182492.

The previous prime is 1379579. The next prime is 1379603. The reversal of 1379581 is 1859731.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1859731 = 37 ⋅50263.

It is a cyclic number.

It is not a de Polignac number, because 1379581 - 2¹ = 1379579 is a prime.

It is a super-2 number, since 2×1379581² = 3806487471122, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

1379581 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1379681) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 98535 + ... + 98548.

It is an arithmetic number, because the mean of its divisors is an integer number (394168).

2^1379581 is an apocalyptic number.

It is an amenable number.

1379581 is a deficient number, since it is larger than the sum of its proper divisors (197091).

1379581 is an equidigital number, since it uses as much as digits as its factorization.

1379581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197090.

The product of its digits is 7560, while the sum is 34.

The square root of 1379581 is about 1174.5556606649. Note that the first 3 decimals coincide. The cubic root of 1379581 is about 111.3223591878.

The spelling of 1379581 in words is "one million, three hundred seventy-nine thousand, five hundred eighty-one".