1572721132 has 24 divisors (see below), whose sum is σ = 2833760160. Its totient is φ = 763271040.

The previous prime is 1572721081. The next prime is 1572721133. The reversal of 1572721132 is 2311272751.

It is a super-2 number, since 2×1572721132² = 4946903518078722848, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1572721094 and 1572721103.

It is not an unprimeable number, because it can be changed into a prime (1572721133) 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, 7969 + ... + 56647.

It is an arithmetic number, because the mean of its divisors is an integer number (118073340).

Almost surely, 2^1572721132 is an apocalyptic number.

It is an amenable number.

1572721132 is a deficient number, since it is larger than the sum of its proper divisors (1261039028).

1572721132 is a wasteful number, since it uses less digits than its factorization.

1572721132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48921 (or 48919 counting only the distinct ones).

The product of its digits is 5880, while the sum is 31.

The square root of 1572721132 is about 39657.5482348569. The cubic root of 1572721132 is about 1162.9219667056.

Adding to 1572721132 its reverse (2311272751), we get a palindrome (3883993883).

It can be divided in two parts, 157272 and 1132, that added together give a square (158404 = 398²).

The spelling of 1572721132 in words is "one billion, five hundred seventy-two million, seven hundred twenty-one thousand, one hundred thirty-two".