403240340 has 24 divisors (see below), whose sum is σ = 896617512. Its totient is φ = 151808000.

The previous prime is 403240333. The next prime is 403240361. The reversal of 403240340 is 43042304.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 5317636 + 397922704 = 2306^2 + 19948^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

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, 592661 + ... + 593340.

It is an arithmetic number, because the mean of its divisors is an integer number (37359063).

Almost surely, 2^403240340 is an apocalyptic number.

It is an amenable number.

403240340 is an abundant number, since it is smaller than the sum of its proper divisors (493377172).

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

403240340 is a wasteful number, since it uses less digits than its factorization.

403240340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1186027 (or 1186025 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 20.

The square root of 403240340 is about 20080.8451017381. The cubic root of 403240340 is about 738.7905371026.

Adding to 403240340 its reverse (43042304), we get a palindrome (446282644).

The spelling of 403240340 in words is "four hundred three million, two hundred forty thousand, three hundred forty".