1051399400 has 96 divisors (see below), whose sum is σ = 2564835840. Its totient is φ = 400354560.

The previous prime is 1051399381. The next prime is 1051399421. The reversal of 1051399400 is 49931501.

It is a super-2 number, since 2×1051399400² = 2210881396640720000, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 346289 + ... + 349311.

It is an arithmetic number, because the mean of its divisors is an integer number (26717040).

Almost surely, 2^1051399400 is an apocalyptic number.

1051399400 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 1051399400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1282417920).

1051399400 is an abundant number, since it is smaller than the sum of its proper divisors (1513436440).

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

1051399400 is a wasteful number, since it uses less digits than its factorization.

1051399400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3123 (or 3114 counting only the distinct ones).

The product of its (nonzero) digits is 4860, while the sum is 32.

The square root of 1051399400 is about 32425.2895129712. The cubic root of 1051399400 is about 1016.8476944805.

The spelling of 1051399400 in words is "one billion, fifty-one million, three hundred ninety-nine thousand, four hundred".