40102420 has 12 divisors (see below), whose sum is σ = 84215124. Its totient is φ = 16040960.

The previous prime is 40102411. The next prime is 40102427. The reversal of 40102420 is 2420104.

It can be written as a sum of positive squares in 2 ways, for example, as 5008644 + 35093776 = 2238^2 + 5924^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 40102420.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40102427) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1002541 + ... + 1002580.

It is an arithmetic number, because the mean of its divisors is an integer number (7017927).

Almost surely, 2^40102420 is an apocalyptic number.

It is an amenable number.

40102420 is an abundant number, since it is smaller than the sum of its proper divisors (44112704).

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

40102420 is a wasteful number, since it uses less digits than its factorization.

40102420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2005130 (or 2005128 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 13.

The square root of 40102420 is about 6332.6471558109. The cubic root of 40102420 is about 342.2868334526.

Adding to 40102420 its reverse (2420104), we get a palindrome (42522524).

The spelling of 40102420 in words is "forty million, one hundred two thousand, four hundred twenty".