1020400530 has 16 divisors (see below), whose sum is σ = 2448961344. Its totient is φ = 272106800.

The previous prime is 1020400519. The next prime is 1020400531. The reversal of 1020400530 is 350040201.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is not an unprimeable number, because it can be changed into a prime (1020400531) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17006646 + ... + 17006705.

It is an arithmetic number, because the mean of its divisors is an integer number (153060084).

Almost surely, 2^1020400530 is an apocalyptic number.

1020400530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1020400530 is an abundant number, since it is smaller than the sum of its proper divisors (1428560814).

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

1020400530 is a wasteful number, since it uses less digits than its factorization.

1020400530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34013361.

The product of its (nonzero) digits is 120, while the sum is 15.

The square root of 1020400530 is about 31943.7087702727. The cubic root of 1020400530 is about 1006.7544513353.

Adding to 1020400530 its reverse (350040201), we get a palindrome (1370440731).

The spelling of 1020400530 in words is "one billion, twenty million, four hundred thousand, five hundred thirty".