1381570 has 8 divisors (see below), whose sum is σ = 2486844. Its totient is φ = 552624.

The previous prime is 1381559. The next prime is 1381609. The reversal of 1381570 is 751831.

It can be written as a sum of positive squares in 2 ways, for example, as 1274641 + 106929 = 1129^2 + 327^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 69069 + ... + 69088.

2^1381570 is an apocalyptic number.

1381570 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1381570 is a deficient number, since it is larger than the sum of its proper divisors (1105274).

1381570 is a wasteful number, since it uses less digits than its factorization.

1381570 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138164.

The product of its (nonzero) digits is 840, while the sum is 25.

The square root of 1381570 is about 1175.4020588718. The cubic root of 1381570 is about 111.3758328747.

The spelling of 1381570 in words is "one million, three hundred eighty-one thousand, five hundred seventy".