1299438420 has 192 divisors, whose sum is σ = 4335206400. Its totient is φ = 284636160.

The previous prime is 1299438407. The next prime is 1299438487. The reversal of 1299438420 is 248349921.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1015341 + ... + 1016619.

It is an arithmetic number, because the mean of its divisors is an integer number (22579200).

Almost surely, 2^1299438420 is an apocalyptic number.

1299438420 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 1299438420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2167603200).

1299438420 is an abundant number, since it is smaller than the sum of its proper divisors (3035767980).

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

1299438420 is a wasteful number, since it uses less digits than its factorization.

1299438420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1398 (or 1396 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 42.

The square root of 1299438420 is about 36047.7242000102. The cubic root of 1299438420 is about 1091.2357054479.

The spelling of 1299438420 in words is "one billion, two hundred ninety-nine million, four hundred thirty-eight thousand, four hundred twenty".