1390928180 has 24 divisors (see below), whose sum is σ = 2930294472. Its totient is φ = 554591232.

The previous prime is 1390928177. The next prime is 1390928183. The reversal of 1390928180 is 818290931.

It is an interprime number because it is at equal distance from previous prime (1390928177) and next prime (1390928183).

It can be written as a sum of positive squares in 4 ways, for example, as 12588304 + 1378339876 = 3548^2 + 37126^2 .

It is a super-2 number, since 2×1390928180² = 3869362403836224800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1390928183) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 104837 + ... + 117356.

It is an arithmetic number, because the mean of its divisors is an integer number (122095603).

Almost surely, 2^1390928180 is an apocalyptic number.

1390928180 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1390928180 is an abundant number, since it is smaller than the sum of its proper divisors (1539366292).

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

1390928180 is a wasteful number, since it uses less digits than its factorization.

1390928180 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222515 (or 222513 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 41.

The square root of 1390928180 is about 37295.1495505783. The cubic root of 1390928180 is about 1116.2673838922.

The spelling of 1390928180 in words is "one billion, three hundred ninety million, nine hundred twenty-eight thousand, one hundred eighty".