1390275390 has 64 divisors (see below), whose sum is σ = 3827658240. Its totient is φ = 316583040.

The previous prime is 1390275379. The next prime is 1390275409. The reversal of 1390275390 is 935720931.

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 31 ways as a sum of consecutive naturals, for example, 44185 + ... + 68795.

It is an arithmetic number, because the mean of its divisors is an integer number (59807160).

Almost surely, 2^1390275390 is an apocalyptic number.

1390275390 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 1390275390, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1913829120).

1390275390 is an abundant number, since it is smaller than the sum of its proper divisors (2437382850).

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

1390275390 is a wasteful number, since it uses less digits than its factorization.

1390275390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24897.

The product of its (nonzero) digits is 51030, while the sum is 39.

The square root of 1390275390 is about 37286.3968492532. The cubic root of 1390275390 is about 1116.0927278072.

The spelling of 1390275390 in words is "one billion, three hundred ninety million, two hundred seventy-five thousand, three hundred ninety".