151720 has 16 divisors (see below), whose sum is σ = 341460. Its totient is φ = 60672.

The previous prime is 151717. The next prime is 151729. The reversal of 151720 is 27151.

It can be written as a sum of positive squares in 2 ways, for example, as 142884 + 8836 = 378^2 + 94^2 .

It is a junction number, because it is equal to n+sod(n) for n = 151694 and 151703.

It is not an unprimeable number, because it can be changed into a prime (151729) 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, 1857 + ... + 1936.

2¹⁵¹⁷²⁰ is an apocalyptic number.

151720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

151720 is an abundant number, since it is smaller than the sum of its proper divisors (189740).

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

151720 is a wasteful number, since it uses less digits than its factorization.

It is an anagram of its base 9 representation: 151720 = (251107)₉.

151720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3804 (or 3800 counting only the distinct ones).

The product of its (nonzero) digits is 70, while the sum is 16.

The square root of 151720 is about 389.5125158451. The cubic root of 151720 is about 53.3352429872.

Adding to 151720 its reverse (27151), we get a palindrome (178871).

The spelling of 151720 in words is "one hundred fifty-one thousand, seven hundred twenty".