402172740 has 144 divisors (see below), whose sum is σ = 1301069952. Its totient is φ = 100205568.

The previous prime is 402172739. The next prime is 402172747. The reversal of 402172740 is 47271204.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (402172747) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 510627 + ... + 511413.

It is an arithmetic number, because the mean of its divisors is an integer number (9035208).

Almost surely, 2^402172740 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 402172740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (650534976).

402172740 is an abundant number, since it is smaller than the sum of its proper divisors (898897212).

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

402172740 is a wasteful number, since it uses less digits than its factorization.

402172740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 986 (or 981 counting only the distinct ones).

The product of its (nonzero) digits is 3136, while the sum is 27.

The square root of 402172740 is about 20054.2449371698. The cubic root of 402172740 is about 738.1379652612.

The spelling of 402172740 in words is "four hundred two million, one hundred seventy-two thousand, seven hundred forty".