1520387478 has 12 divisors (see below), whose sum is σ = 3294172908. Its totient is φ = 506795820.

The previous prime is 1520387471. The next prime is 1520387489. The reversal of 1520387478 is 8747830251.

1520387478 is a `hidden beast` number, since 1 + 520 + 3 + 87 + 47 + 8 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1520387471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 42232968 + ... + 42233003.

It is an arithmetic number, because the mean of its divisors is an integer number (274514409).

Almost surely, 2^1520387478 is an apocalyptic number.

1520387478 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1520387478 is an abundant number, since it is smaller than the sum of its proper divisors (1773785430).

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

1520387478 is a wasteful number, since it uses less digits than its factorization.

1520387478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84465979 (or 84465976 counting only the distinct ones).

The product of its (nonzero) digits is 376320, while the sum is 45.

The square root of 1520387478 is about 38992.1463630819. The cubic root of 1520387478 is about 1149.8771079769.

The spelling of 1520387478 in words is "one billion, five hundred twenty million, three hundred eighty-seven thousand, four hundred seventy-eight".