1387157772 has 192 divisors, whose sum is σ = 4602092544. Its totient is φ = 312975360.

The previous prime is 1387157771. The next prime is 1387157773. The reversal of 1387157772 is 2777517831.

It is an interprime number because it is at equal distance from previous prime (1387157771) and next prime (1387157773).

It is not an unprimeable number, because it can be changed into a prime (1387157771) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 200808 + ... + 207600.

It is an arithmetic number, because the mean of its divisors is an integer number (23969232).

Almost surely, 2^1387157772 is an apocalyptic number.

1387157772 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1387157772, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2301046272).

1387157772 is an abundant number, since it is smaller than the sum of its proper divisors (3214934772).

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

1387157772 is a wasteful number, since it uses less digits than its factorization.

1387157772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6848 (or 6846 counting only the distinct ones).

The product of its digits is 576240, while the sum is 48.

The square root of 1387157772 is about 37244.5670131900. The cubic root of 1387157772 is about 1115.2578440736.

The spelling of 1387157772 in words is "one billion, three hundred eighty-seven million, one hundred fifty-seven thousand, seven hundred seventy-two".