1392681240 has 96 divisors (see below), whose sum is σ = 4600486800. Its totient is φ = 365287680.

The previous prime is 1392681233. The next prime is 1392681271. The reversal of 1392681240 is 421862931.

It is a super-2 number, since 2×1392681240² = 3879122072495875200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 1392681195 and 1392681204.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9750 + ... + 53669.

Almost surely, 2^1392681240 is an apocalyptic number.

1392681240 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 1392681240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2300243400).

1392681240 is an abundant number, since it is smaller than the sum of its proper divisors (3207805560).

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

1392681240 is a wasteful number, since it uses less digits than its factorization.

1392681240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63497 (or 63490 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 1392681240 is about 37318.6446699234. The cubic root of 1392681240 is about 1116.7361505240.

The spelling of 1392681240 in words is "one billion, three hundred ninety-two million, six hundred eighty-one thousand, two hundred forty".