1400640 has 56 divisors (see below), whose sum is σ = 4450080. Its totient is φ = 373248.

The previous prime is 1400627. The next prime is 1400653. The reversal of 1400640 is 460041.

It is an interprime number because it is at equal distance from previous prime (1400627) and next prime (1400653).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 231 + ... + 1689.

2^1400640 is an apocalyptic number.

1400640 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 1400640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2225040).

1400640 is an abundant number, since it is smaller than the sum of its proper divisors (3049440).

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

1400640 is a wasteful number, since it uses less digits than its factorization.

1400640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1479 (or 1469 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 1400640 is about 1183.4863750800. The cubic root of 1400640 is about 111.8859382998.

Adding to 1400640 its reverse (460041), we get a palindrome (1860681).

The spelling of 1400640 in words is "one million, four hundred thousand, six hundred forty".