1387751616 has 336 divisors, whose sum is σ = 4543287840. Its totient is φ = 418037760.

The previous prime is 1387751597. The next prime is 1387751623. The reversal of 1387751616 is 6161577831.

It is a super-2 number, since 2×1387751616² = 3851709095421222912, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 7667046 + ... + 7667226.

It is an arithmetic number, because the mean of its divisors is an integer number (13521690).

Almost surely, 2^1387751616 is an apocalyptic number.

1387751616 is a gapful number since it is divisible by the number (16) 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 1387751616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2271643920).

1387751616 is an abundant number, since it is smaller than the sum of its proper divisors (3155536224).

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

1387751616 is a wasteful number, since it uses less digits than its factorization.

1387751616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 254 (or 232 counting only the distinct ones).

The product of its digits is 211680, while the sum is 45.

The square root of 1387751616 is about 37252.5383833102. The cubic root of 1387751616 is about 1115.4169691340.

The spelling of 1387751616 in words is "one billion, three hundred eighty-seven million, seven hundred fifty-one thousand, six hundred sixteen".