1390423518 has 96 divisors (see below), whose sum is σ = 3439923552. Its totient is φ = 402105600.

The previous prime is 1390423493. The next prime is 1390423543. The reversal of 1390423518 is 8153240931.

1390423518 is a `hidden beast` number, since 13 + 90 + 42 + 3 + 518 = 666.

1390423518 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (1390423493) and next prime (1390423543).

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, 386488 + ... + 390068.

It is an arithmetic number, because the mean of its divisors is an integer number (35832537).

Almost surely, 2^1390423518 is an apocalyptic number.

1390423518 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1390423518, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1719961776).

1390423518 is an abundant number, since it is smaller than the sum of its proper divisors (2049500034).

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

1390423518 is a wasteful number, since it uses less digits than its factorization.

1390423518 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3690 (or 3687 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The square root of 1390423518 is about 37288.3831507884. The cubic root of 1390423518 is about 1116.1323647294.

The spelling of 1390423518 in words is "one billion, three hundred ninety million, four hundred twenty-three thousand, five hundred eighteen".