1400539840 has 224 divisors, whose sum is σ = 3981809664. Its totient is φ = 459264000.

The previous prime is 1400539813. The next prime is 1400539879. The reversal of 1400539840 is 489350041.

It is a tau number, because it is divible by the number of its divisors (224).

It is a junction number, because it is equal to n+sod(n) for n = 1400539796 and 1400539805.

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, 5579715 + ... + 5579965.

It is an arithmetic number, because the mean of its divisors is an integer number (17775936).

Almost surely, 2^1400539840 is an apocalyptic number.

1400539840 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 1400539840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1990904832).

1400539840 is an abundant number, since it is smaller than the sum of its proper divisors (2581269824).

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

1400539840 is a wasteful number, since it uses less digits than its factorization.

1400539840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 375 (or 365 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 34.

The square root of 1400539840 is about 37423.7870878937. The cubic root of 1400539840 is about 1118.8327124224.

Adding to 1400539840 its reverse (489350041), we get a palindrome (1889889881).

The spelling of 1400539840 in words is "one billion, four hundred million, five hundred thirty-nine thousand, eight hundred forty".