155782840 has 16 divisors (see below), whose sum is σ = 350511480. Its totient is φ = 62313120.

The previous prime is 155782831. The next prime is 155782859. The reversal of 155782840 is 48287551.

It is a Harshad number since it is a multiple of its sum of digits (40), and also a Moran number because the ratio is a prime number: 3894571 = 155782840 / (1 + 5 + 5 + 7 + 8 + 2 + 8 + 4 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 155782793 and 155782802.

It is a congruent number.

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, 1947246 + ... + 1947325.

Almost surely, 2^155782840 is an apocalyptic number.

155782840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

155782840 is an abundant number, since it is smaller than the sum of its proper divisors (194728640).

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

155782840 is a wasteful number, since it uses less digits than its factorization.

155782840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3894582 (or 3894578 counting only the distinct ones).

The product of its (nonzero) digits is 89600, while the sum is 40.

The square root of 155782840 is about 12481.2996118193. The cubic root of 155782840 is about 538.0713549448.

The spelling of 155782840 in words is "one hundred fifty-five million, seven hundred eighty-two thousand, eight hundred forty".