1387684220 has 48 divisors (see below), whose sum is σ = 3246536160. Its totient is φ = 494704896.

The previous prime is 1387684201. The next prime is 1387684271. The reversal of 1387684220 is 224867831.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 84482 + ... + 99561.

It is an arithmetic number, because the mean of its divisors is an integer number (67636170).

Almost surely, 2^1387684220 is an apocalyptic number.

1387684220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1387684220 is an abundant number, since it is smaller than the sum of its proper divisors (1858851940).

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

1387684220 is a wasteful number, since it uses less digits than its factorization.

1387684220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184094 (or 184092 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 41.

The square root of 1387684220 is about 37251.6337896742. The cubic root of 1387684220 is about 1115.3989121421.

The spelling of 1387684220 in words is "one billion, three hundred eighty-seven million, six hundred eighty-four thousand, two hundred twenty".