1390050640 has 80 divisors (see below), whose sum is σ = 3711280320. Its totient is φ = 478863360.

The previous prime is 1390050631. The next prime is 1390050661. The reversal of 1390050640 is 460500931.

It is a tau number, because it is divible by the number of its divisors (80).

It is a junction number, because it is equal to n+sod(n) for n = 1390050599 and 1390050608.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24849 + ... + 58288.

It is an arithmetic number, because the mean of its divisors is an integer number (46391004).

Almost surely, 2^1390050640 is an apocalyptic number.

1390050640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1390050640 is an abundant number, since it is smaller than the sum of its proper divisors (2321229680).

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

1390050640 is a wasteful number, since it uses less digits than its factorization.

1390050640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83180 (or 83174 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 1390050640 is about 37283.3828937236. The cubic root of 1390050640 is about 1116.0325825630.

The spelling of 1390050640 in words is "one billion, three hundred ninety million, fifty thousand, six hundred forty".