7542390 has 64 divisors (see below), whose sum is σ = 20030976. Its totient is φ = 1807872.

The previous prime is 7542389. The next prime is 7542439. The reversal of 7542390 is 932457.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11409 + ... + 12051.

It is an arithmetic number, because the mean of its divisors is an integer number (312984).

Almost surely, 2^7542390 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7542390, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10015488).

7542390 is an abundant number, since it is smaller than the sum of its proper divisors (12488586).

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

7542390 is a wasteful number, since it uses less digits than its factorization.

7542390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 693.

The product of its (nonzero) digits is 7560, while the sum is 30.

The square root of 7542390 is about 2746.3412024000. The cubic root of 7542390 is about 196.1114699812. Note that the first 3 decimals are identical.

The spelling of 7542390 in words is "seven million, five hundred forty-two thousand, three hundred ninety".