1387778232 has 32 divisors (see below), whose sum is σ = 3620292480. Its totient is φ = 442479840.

The previous prime is 1387778219. The next prime is 1387778233. The reversal of 1387778232 is 2328777831.

It is a happy number.

1387778232 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1387778233) 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, 1256494 + ... + 1257597.

It is an arithmetic number, because the mean of its divisors is an integer number (113134140).

Almost surely, 2^1387778232 is an apocalyptic number.

1387778232 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1387778232 is an abundant number, since it is smaller than the sum of its proper divisors (2232514248).

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

1387778232 is a wasteful number, since it uses less digits than its factorization.

1387778232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2514123 (or 2514119 counting only the distinct ones).

The product of its digits is 790272, while the sum is 48.

The square root of 1387778232 is about 37252.8956189985. The cubic root of 1387778232 is about 1115.4241000326.

The spelling of 1387778232 in words is "one billion, three hundred eighty-seven million, seven hundred seventy-eight thousand, two hundred thirty-two".