1388620830 has 32 divisors (see below), whose sum is σ = 3351966624. Its totient is φ = 368157056.

The previous prime is 1388620763. The next prime is 1388620853. The reversal of 1388620830 is 380268831.

It is a Curzon number.

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, 128589 + ... + 138968.

It is an arithmetic number, because the mean of its divisors is an integer number (104748957).

Almost surely, 2^1388620830 is an apocalyptic number.

1388620830 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1388620830 is an abundant number, since it is smaller than the sum of its proper divisors (1963345794).

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

1388620830 is a wasteful number, since it uses less digits than its factorization.

1388620830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 267740.

The product of its (nonzero) digits is 55296, while the sum is 39.

The square root of 1388620830 is about 37264.2030640667. The cubic root of 1388620830 is about 1115.6497998708.

It can be divided in two parts, 13886 and 20830, that added together give a triangular number (34716 = T₂₆₃).

The spelling of 1388620830 in words is "one billion, three hundred eighty-eight million, six hundred twenty thousand, eight hundred thirty".