1388734590 has 96 divisors (see below), whose sum is σ = 3655471104. Its totient is φ = 337236480.

The previous prime is 1388734583. The next prime is 1388734609. The reversal of 1388734590 is 954378831.

It is a super-2 number, since 2×1388734590² = 3857167522924936200, which contains 22 as substring.

It is a congruent number.

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, 266187 + ... + 271353.

It is an arithmetic number, because the mean of its divisors is an integer number (38077824).

Almost surely, 2^1388734590 is an apocalyptic number.

1388734590 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1388734590, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1827735552).

1388734590 is an abundant number, since it is smaller than the sum of its proper divisors (2266736514).

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

1388734590 is a wasteful number, since it uses less digits than its factorization.

1388734590 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5242 (or 5225 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 48.

The square root of 1388734590 is about 37265.7294306713. The cubic root of 1388734590 is about 1115.6802648360.

The spelling of 1388734590 in words is "one billion, three hundred eighty-eight million, seven hundred thirty-four thousand, five hundred ninety".