151720040 has 16 divisors (see below), whose sum is σ = 341370180. Its totient is φ = 60688000.

The previous prime is 151720033. The next prime is 151720069. The reversal of 151720040 is 40027151.

It can be written as a sum of positive squares in 2 ways, for example, as 141467236 + 10252804 = 11894^2 + 3202^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 151719994 and 151720021.

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, 1896461 + ... + 1896540.

Almost surely, 2^151720040 is an apocalyptic number.

151720040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

151720040 is an abundant number, since it is smaller than the sum of its proper divisors (189650140).

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

151720040 is a wasteful number, since it uses less digits than its factorization.

151720040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3793012 (or 3793008 counting only the distinct ones).

The product of its (nonzero) digits is 280, while the sum is 20.

The square root of 151720040 is about 12317.4688958406. The cubic root of 151720040 is about 533.3524767434.

Adding to 151720040 its reverse (40027151), we get a palindrome (191747191).

The spelling of 151720040 in words is "one hundred fifty-one million, seven hundred twenty thousand, forty".