3992400 has 90 divisors (see below), whose sum is σ = 13867230. Its totient is φ = 1063680.

The previous prime is 3992393. The next prime is 3992407. The reversal of 3992400 is 42993.

It is an interprime number because it is at equal distance from previous prime (3992393) and next prime (3992407).

It can be written as a sum of positive squares in 3 ways, for example, as 24336 + 3968064 = 156^2 + 1992^2 .

It is a tau number, because it is divible by the number of its divisors (90).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3992407) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 3046 + ... + 4154.

Almost surely, 2^3992400 is an apocalyptic number.

3992400 is a gapful number since it is divisible by the number (30) 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 3992400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6933615).

3992400 is an abundant number, since it is smaller than the sum of its proper divisors (9874830).

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

3992400 is a wasteful number, since it uses less digits than its factorization.

3992400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1133 (or 1119 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 27.

The square root of 3992400 is about 1998.0990966416. The cubic root of 3992400 is about 158.6395060571.

The spelling of 3992400 in words is "three million, nine hundred ninety-two thousand, four hundred".