1421552640 has 176 divisors, whose sum is σ = 4787032320. Its totient is φ = 359055360.

The previous prime is 1421552633. The next prime is 1421552663. The reversal of 1421552640 is 462551241.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 1421552598 and 1421552607.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 289405 + ... + 294275.

Almost surely, 2^1421552640 is an apocalyptic number.

1421552640 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 1421552640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2393516160).

1421552640 is an abundant number, since it is smaller than the sum of its proper divisors (3365479680).

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

1421552640 is a wasteful number, since it uses less digits than its factorization.

1421552640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4918 (or 4900 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 30.

The square root of 1421552640 is about 37703.4831282204. The cubic root of 1421552640 is about 1124.4003757661.

The spelling of 1421552640 in words is "one billion, four hundred twenty-one million, five hundred fifty-two thousand, six hundred forty".