1400647640 has 32 divisors (see below), whose sum is σ = 3601666080. Its totient is φ = 480221952.

The previous prime is 1400647631. The next prime is 1400647649. The reversal of 1400647640 is 467460041.

It is an interprime number because it is at equal distance from previous prime (1400647631) and next prime (1400647649).

It is a super-2 number, since 2×1400647640² = 3923627622875139200, which contains 22 as substring.

It is a Smith number, since the sum of its digits (32) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 1400647597 and 1400647606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1400647649) 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, 2500877 + ... + 2501436.

It is an arithmetic number, because the mean of its divisors is an integer number (112552065).

Almost surely, 2^1400647640 is an apocalyptic number.

1400647640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1400647640 is an abundant number, since it is smaller than the sum of its proper divisors (2201018440).

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

1400647640 is a wasteful number, since it uses less digits than its factorization.

1400647640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5002331 (or 5002327 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 32.

The square root of 1400647640 is about 37425.2273206189. The cubic root of 1400647640 is about 1118.8614173233.

The spelling of 1400647640 in words is "one billion, four hundred million, six hundred forty-seven thousand, six hundred forty".