1402405440 has 224 divisors, whose sum is σ = 4649394816. Its totient is φ = 357826560.

The previous prime is 1402405423. The next prime is 1402405457. The reversal of 1402405440 is 445042041.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1402405423) and next prime (1402405457).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 1402405440.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2187520 + ... + 2188160.

Almost surely, 2^1402405440 is an apocalyptic number.

1402405440 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 1402405440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2324697408).

1402405440 is an abundant number, since it is smaller than the sum of its proper divisors (3246989376).

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

1402405440 is a wasteful number, since it uses less digits than its factorization.

1402405440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 757 (or 747 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 24.

The square root of 1402405440 is about 37448.7041164311. The cubic root of 1402405440 is about 1119.3292752798.

Adding to 1402405440 its reverse (445042041), we get a palindrome (1847447481).

The spelling of 1402405440 in words is "one billion, four hundred two million, four hundred five thousand, four hundred forty".