1642425400 has 192 divisors, whose sum is σ = 4968967680. Its totient is φ = 489561600.

The previous prime is 1642425397. The next prime is 1642425409. The reversal of 1642425400 is 45242461.

It is a super-2 number, since 2×1642425400² = 5395122389130320000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1642425409) 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, 351882 + ... + 356518.

It is an arithmetic number, because the mean of its divisors is an integer number (25880040).

Almost surely, 2^1642425400 is an apocalyptic number.

1642425400 is a gapful number since it is divisible by the number (10) 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 1642425400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2484483840).

1642425400 is an abundant number, since it is smaller than the sum of its proper divisors (3326542280).

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

1642425400 is a wasteful number, since it uses less digits than its factorization.

1642425400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4694 (or 4685 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 28.

The square root of 1642425400 is about 40526.8478912437. The cubic root of 1642425400 is about 1179.8547652335.

Adding to 1642425400 its reverse (45242461), we get a palindrome (1687667861).

The spelling of 1642425400 in words is "one billion, six hundred forty-two million, four hundred twenty-five thousand, four hundred".