402040 has 48 divisors (see below), whose sum is σ = 995400. Its totient is φ = 145728.

The previous prime is 402037. The next prime is 402043. The reversal of 402040 is 40204.

It is an interprime number because it is at equal distance from previous prime (402037) and next prime (402043).

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402043) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17469 + ... + 17491.

2⁴⁰²⁰⁴⁰ is an apocalyptic number.

402040 is a gapful number since it is divisible by the number (40) 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 402040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (497700).

402040 is an abundant number, since it is smaller than the sum of its proper divisors (593360).

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

402040 is a wasteful number, since it uses less digits than its factorization.

402040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76 (or 49 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 10.

The square root of 402040 is about 634.0662425962. The cubic root of 402040 is about 73.8056747080.

402040 divided by its sum of digits (10) gives a palindrome (40204).

Adding to 402040 its reverse (40204), we get a palindrome (442244).

It can be divided in two parts, 40 and 2040, that added together give a triangular number (2080 = T₆₄).

The spelling of 402040 in words is "four hundred two thousand, forty", and thus it is an iban number.