1390804140 has 96 divisors (see below), whose sum is σ = 4256146944. Its totient is φ = 336540160.

The previous prime is 1390804133. The next prime is 1390804141. The reversal of 1390804140 is 414080931.

It is a happy number.

It is a super-2 number, since 2×1390804140² = 3868672311682279200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 1390804098 and 1390804107.

It is not an unprimeable number, because it can be changed into a prime (1390804141) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 425392 + ... + 428648.

It is an arithmetic number, because the mean of its divisors is an integer number (44334864).

Almost surely, 2^1390804140 is an apocalyptic number.

1390804140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1390804140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2128073472).

1390804140 is an abundant number, since it is smaller than the sum of its proper divisors (2865342804).

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

1390804140 is a wasteful number, since it uses less digits than its factorization.

1390804140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3927 (or 3925 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 1390804140 is about 37293.4865626694. The cubic root of 1390804140 is about 1116.2342007932.

The spelling of 1390804140 in words is "one billion, three hundred ninety million, eight hundred four thousand, one hundred forty".