1381572 has 18 divisors (see below), whose sum is σ = 3492398. Its totient is φ = 460512.

The previous prime is 1381559. The next prime is 1381609. The reversal of 1381572 is 2751831.

1381572 is a `hidden beast` number, since 13 + 81 + 572 = 666.

It can be written as a sum of positive squares in only one way, i.e., 715716 + 665856 = 846^2 + 816^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 19153 + ... + 19224.

2^1381572 is an apocalyptic number.

1381572 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1381572 is an abundant number, since it is smaller than the sum of its proper divisors (2110826).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1381572 is a wasteful number, since it uses less digits than its factorization.

1381572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38387 (or 38382 counting only the distinct ones).

The product of its digits is 1680, while the sum is 27.

The square root of 1381572 is about 1175.4029096442. The cubic root of 1381572 is about 111.3758866183.

It can be divided in two parts, 1381 and 572, that added together give a triangular number (1953 = T₆₂).

The spelling of 1381572 in words is "one million, three hundred eighty-one thousand, five hundred seventy-two".